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19 of the Best Books of 2021

book review literature review

A bookworm is happiest when they’re surrounded by books — both old and new. Undoubtedly, 2021 was a great year for both fiction and nonfiction, with bestsellers like Detransition, Baby by Torrey Peters and Second Place by Rachel Cusk. Whether you read memoirs or young-adult (YA) novels, 2021 was a fantastic year for book lovers. While we can’t squeeze in all of our favorites from 2021, we’ve rounded up a stellar sampling of must-reads. Here’s some of the year’s best books. 

“Crying in H Mart: A Memoir” by Michelle Zauner

book review literature review

In her profound memoir Crying in H Mart , Michelle Zauner shares an unflinching view of growing up as a Korean American person — all while reflecting on losing her mother to terminal cancer. Author Dani Shapiro notes that the Japanese Breakfast musician “has created a gripping, sensuous portrait of an indelible mother-daughter bond that hits all the notes: love, friction, loyalty, grief.”

“The Prophets” by Robert Jones, Jr.

book review literature review

In Robert Jones, Jr.’s lyrical debut novel, The Prophets , Isaiah and Samuel are two enslaved young men who find refuge in each other — and their love becomes both sustaining and heroic in the face of a vicious world. Entertainment Weekly writes that “While The Prophets’ dreamy realism recalls the work of Toni Morrison… Its penetrating focus on social dynamics stands out more singularly.” Now that’s a compliment.

“The Hill We Climb” by Amanda Gorman

book review literature review

At President Joe Biden’s inauguration, Amanda Gorman read her electrifying poem, “ The Hill We Climb .” Since then, it has been praised for its call for unity and healing. Vogue captures the feeling of reading the poem well, calling it “deeply rousing and uplifting.” 

“Beautiful World, Where Are You” by Sally Rooney

book review literature review

New York Times bestselling author Sally Rooney has returned with a sharp, romantic drama, Beautiful World, Where Are You . Two separate relationships are in chaos, threatening to ruin friendships. Vogue  declares that the author has “invented a sensibility entirely of her own: Sunny and sharp.” 

“Somebody’s Daughter: A Memoir” by Ashley C. Ford

book review literature review

Ashley C. Ford’s coming-of-age memoir, Somebody’s Daughter , centers on her childhood. Ford, a Black girl who grew up poor in Indiana, recounts how her family was fragmented by her father’s incarceration. With rich, unflinching writing, Ford has penned a debut for the ages. The memoir’s publisher perhaps puts the core of the book best, noting that Ford “embarks on a powerful journey to find the threads between who she is and what she was born into, and the complicated familial love that often binds them.” 

“Last Night at the Telegraph Club” by Malinda Lo

book review literature review

Everyone remembers their first all-consuming love — and for Lily Hu, the teenage protagonist of Malinda Lo’s queer YA novel, that love is Kathleen Miller. Set in the 1950s in San Francisco,  Last Night at the Telegraph Club  is not just one of the year’s best, but one of Lo’s best. O: The Oprah Magazine notes that the novel is “proof of Lo’s skill at creating darkly romantic tales of love in the face of danger.”

“¡Hola Papi!” by John Paul Brammer

book review literature review

In his memoir, ¡H ola Papi!: How to Come Out in a Walmart Parking Lot and Other Life Lessons , advice columnist John Paul Brammer delves into his experiences growing up as a queer, biracial person. The  Los Angeles Times  writes that “Brammer’s writing is incredibly funny, kind, and gracious to his readers, and deeply vulnerable in a way that makes it feel as if he’s talking to only you” — and we couldn’t agree more. 

“Honey Girl” by Morgan Rogers

book review literature review

In Morgan Rogers’ novel Honey Girl , Grace Porter is an overachiever — and certainly not the type of person to marry a stranger in Las Vegas. Or, at least, she didn’t think she was that type of person. As Grace navigates the messiness of adulthood, Rogers takes us on a journey that’s both heartfelt and unflinching, illustrating that love is all about risks — even when it comes to loving ourselves. 

“Aftershocks: A Memoir” by Nadia Owusu

book review literature review

Nadia Owusu’s memoir, Aftershocks , reflects on her experience of being abandoned by her parents at a young age. Entertainment Weekly notes that “Owusu dispatches all of this heartache with blistering honesty but does so with prose light enough that it never feels too much to bear.”

“Klara and the Sun” by Kazuo Ishiguro

book review literature review

What if an artificial intelligence (AI) assistant had feelings? In Kazuo Ishiguro’s latest novel,  Klara and the Sun , Klara is an Artificial Friend who wonders if friendship is possible. The Financial Times called the Never Let Me Go author’s latest “a deft dystopian fable about the innocence of a robot that asks big questions about existence.”

“100 Boyfriends” by Brontez Purnell

book review literature review

Brontez Purnell’s romantic, intoxicating book, 100 Boyfriends , is a look at the romantic lives of queer men who are striving to find out not just where they belong, but where they can shine. Author Bryan Washington praised the collection, writing that “Each story in 100 Boyfriends is a minor eclipse: stunning in scope, technically blinding, and entirely miraculous.”

“One Last Stop” by Casey McQuiston

book review literature review

In Casey McQuiston’s big-hearted romance novel, One Last Stop , August meets Jane on a New York City subway — but she doesn’t realize just how fateful their chance encounter is at first. New York Magazine called the novel “an earnest reminder that home — whether that means a time, a place, or a person — is worth fighting for,” and we wouldn’t expect anything less from the  Red, White & Royal Blue author. 

“Afterparties: Stories” by Anthony Veasna So

book review literature review

In Afterparties , Anthony Veasna So weaves together tenderhearted stories about the lives of several Cambodian American characters. Although the stories vary quite a bit in terms of content, author George Saunders writes that they are all “powered by So’s skill with the telling detail,” and are much like “…beams of wry, affectionate light, falling from different directions on a complicated, struggling, beloved American community.”

“Malibu Rising” by Taylor Jenkins Reid

book review literature review

In Taylor Jenkins Reid’s novel Malibu Rising , readers meet four famous siblings as they throw their annual end-of-summer party in Malibu. However, over the course of 24 hours, family drama ensues. The Washington Post calls this read “a fast-paced, engaging novel that smoothly transports readers.”

“Let Me Tell You What I Mean” by Joan Didion

book review literature review

Between 1968 and 2000, award-winning journalist and essayist Joan Didion wrote 12 pieces about a variety of well-known figures, ranging from Ernest Hemingway and Nancy Reagan to Martha Stewart. Now, these works have been gathered in the essay collection Let Me Tell You What I Mean . Bret Easton Ellis writes that Didion’s “prose remains peerless,” so, if you’re a fan of the iconic writer, this is a must-read. 

“Intimacies” by Katie Kitamura

book review literature review

Intimacies is Katie Kitamura’s fourth novel, following 2017’s critically acclaimed A Separation . In it, an interpreter for the International Court at the Hague gets drawn into a political scandal after agreeing to translate for a former world leader and potential criminal. The novel is a fascinating investigation into the instability of language and how it influences identity. Dana Spiotta describes Intimacies as “a haunting, precise, and morally astute novel that reads like a psychological thriller.”

“Detransition, Baby” by Torrey Peters

book review literature review

In Detransition, Baby , Torrey Peters tells a witty and nuanced story about partnership, parenthood and identity. About the novel, Ginny Hogan from the New York Times states “[Detransition, Baby upends] our traditional, gendered notions of what parenthood can look like.”

“Second Place” by Rachel Cusk

book review literature review

In Rachel Cusk’s novel Second Place , a follow up to her brilliant Outline trilogy, a woman invites an artist she admires to live in her remote guesthouse for the summer. As the stay unfolds, a series of unexpected events spurs revelations about womanhood, marriage and security. About Second Place , Jenny Singer from Glamour writes “there is mayhem; surprising sweetness and brilliant observations tumble from every page.”

“Sellout: The Major-Label Feeding Frenzy That Swept Punk, Emo, and Hardcore ” by Dan Ozzi

book review literature review

In Sellout: The Major-Label Feeding Frenzy That Swept Punk, Emo, and Hardcore , rock critic Dan Ozzi traces the stories of eleven separate bands that transitioned from the indie scene to achieve mainstream success in the ‘90s. Including interviews and anecdotes from bands like Green Day, Jimmy Eat World and Blink-182, this is a must-read for any music lover.

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The Writing Center • University of North Carolina at Chapel Hill

Literature Reviews

What this handout is about.

This handout will explain what literature reviews are and offer insights into the form and construction of literature reviews in the humanities, social sciences, and sciences.

Introduction

OK. You’ve got to write a literature review. You dust off a novel and a book of poetry, settle down in your chair, and get ready to issue a “thumbs up” or “thumbs down” as you leaf through the pages. “Literature review” done. Right?

Wrong! The “literature” of a literature review refers to any collection of materials on a topic, not necessarily the great literary texts of the world. “Literature” could be anything from a set of government pamphlets on British colonial methods in Africa to scholarly articles on the treatment of a torn ACL. And a review does not necessarily mean that your reader wants you to give your personal opinion on whether or not you liked these sources.

What is a literature review, then?

A literature review discusses published information in a particular subject area, and sometimes information in a particular subject area within a certain time period.

A literature review can be just a simple summary of the sources, but it usually has an organizational pattern and combines both summary and synthesis. A summary is a recap of the important information of the source, but a synthesis is a re-organization, or a reshuffling, of that information. It might give a new interpretation of old material or combine new with old interpretations. Or it might trace the intellectual progression of the field, including major debates. And depending on the situation, the literature review may evaluate the sources and advise the reader on the most pertinent or relevant.

But how is a literature review different from an academic research paper?

The main focus of an academic research paper is to develop a new argument, and a research paper is likely to contain a literature review as one of its parts. In a research paper, you use the literature as a foundation and as support for a new insight that you contribute. The focus of a literature review, however, is to summarize and synthesize the arguments and ideas of others without adding new contributions.

Why do we write literature reviews?

Literature reviews provide you with a handy guide to a particular topic. If you have limited time to conduct research, literature reviews can give you an overview or act as a stepping stone. For professionals, they are useful reports that keep them up to date with what is current in the field. For scholars, the depth and breadth of the literature review emphasizes the credibility of the writer in his or her field. Literature reviews also provide a solid background for a research paper’s investigation. Comprehensive knowledge of the literature of the field is essential to most research papers.

Who writes these things, anyway?

Literature reviews are written occasionally in the humanities, but mostly in the sciences and social sciences; in experiment and lab reports, they constitute a section of the paper. Sometimes a literature review is written as a paper in itself.

Let’s get to it! What should I do before writing the literature review?

If your assignment is not very specific, seek clarification from your instructor:

Find models

Look for other literature reviews in your area of interest or in the discipline and read them to get a sense of the types of themes you might want to look for in your own research or ways to organize your final review. You can simply put the word “review” in your search engine along with your other topic terms to find articles of this type on the Internet or in an electronic database. The bibliography or reference section of sources you’ve already read are also excellent entry points into your own research.

Narrow your topic

There are hundreds or even thousands of articles and books on most areas of study. The narrower your topic, the easier it will be to limit the number of sources you need to read in order to get a good survey of the material. Your instructor will probably not expect you to read everything that’s out there on the topic, but you’ll make your job easier if you first limit your scope.

Keep in mind that UNC Libraries have research guides and to databases relevant to many fields of study. You can reach out to the subject librarian for a consultation: https://library.unc.edu/support/consultations/ .

And don’t forget to tap into your professor’s (or other professors’) knowledge in the field. Ask your professor questions such as: “If you had to read only one book from the 90’s on topic X, what would it be?” Questions such as this help you to find and determine quickly the most seminal pieces in the field.

Consider whether your sources are current

Some disciplines require that you use information that is as current as possible. In the sciences, for instance, treatments for medical problems are constantly changing according to the latest studies. Information even two years old could be obsolete. However, if you are writing a review in the humanities, history, or social sciences, a survey of the history of the literature may be what is needed, because what is important is how perspectives have changed through the years or within a certain time period. Try sorting through some other current bibliographies or literature reviews in the field to get a sense of what your discipline expects. You can also use this method to consider what is currently of interest to scholars in this field and what is not.

Strategies for writing the literature review

Find a focus.

A literature review, like a term paper, is usually organized around ideas, not the sources themselves as an annotated bibliography would be organized. This means that you will not just simply list your sources and go into detail about each one of them, one at a time. No. As you read widely but selectively in your topic area, consider instead what themes or issues connect your sources together. Do they present one or different solutions? Is there an aspect of the field that is missing? How well do they present the material and do they portray it according to an appropriate theory? Do they reveal a trend in the field? A raging debate? Pick one of these themes to focus the organization of your review.

Convey it to your reader

A literature review may not have a traditional thesis statement (one that makes an argument), but you do need to tell readers what to expect. Try writing a simple statement that lets the reader know what is your main organizing principle. Here are a couple of examples:

The current trend in treatment for congestive heart failure combines surgery and medicine. More and more cultural studies scholars are accepting popular media as a subject worthy of academic consideration.

Consider organization

You’ve got a focus, and you’ve stated it clearly and directly. Now what is the most effective way of presenting the information? What are the most important topics, subtopics, etc., that your review needs to include? And in what order should you present them? Develop an organization for your review at both a global and local level:

First, cover the basic categories

Just like most academic papers, literature reviews also must contain at least three basic elements: an introduction or background information section; the body of the review containing the discussion of sources; and, finally, a conclusion and/or recommendations section to end the paper. The following provides a brief description of the content of each:

Organizing the body

Once you have the basic categories in place, then you must consider how you will present the sources themselves within the body of your paper. Create an organizational method to focus this section even further.

To help you come up with an overall organizational framework for your review, consider the following scenario:

You’ve decided to focus your literature review on materials dealing with sperm whales. This is because you’ve just finished reading Moby Dick, and you wonder if that whale’s portrayal is really real. You start with some articles about the physiology of sperm whales in biology journals written in the 1980’s. But these articles refer to some British biological studies performed on whales in the early 18th century. So you check those out. Then you look up a book written in 1968 with information on how sperm whales have been portrayed in other forms of art, such as in Alaskan poetry, in French painting, or on whale bone, as the whale hunters in the late 19th century used to do. This makes you wonder about American whaling methods during the time portrayed in Moby Dick, so you find some academic articles published in the last five years on how accurately Herman Melville portrayed the whaling scene in his novel.

Now consider some typical ways of organizing the sources into a review:

Sometimes, though, you might need to add additional sections that are necessary for your study, but do not fit in the organizational strategy of the body. What other sections you include in the body is up to you. Put in only what is necessary. Here are a few other sections you might want to consider:

Questions for Further Research: What questions about the field has the review sparked? How will you further your research as a result of the review?

Begin composing

Once you’ve settled on a general pattern of organization, you’re ready to write each section. There are a few guidelines you should follow during the writing stage as well. Here is a sample paragraph from a literature review about sexism and language to illuminate the following discussion:

However, other studies have shown that even gender-neutral antecedents are more likely to produce masculine images than feminine ones (Gastil, 1990). Hamilton (1988) asked students to complete sentences that required them to fill in pronouns that agreed with gender-neutral antecedents such as “writer,” “pedestrian,” and “persons.” The students were asked to describe any image they had when writing the sentence. Hamilton found that people imagined 3.3 men to each woman in the masculine “generic” condition and 1.5 men per woman in the unbiased condition. Thus, while ambient sexism accounted for some of the masculine bias, sexist language amplified the effect. (Source: Erika Falk and Jordan Mills, “Why Sexist Language Affects Persuasion: The Role of Homophily, Intended Audience, and Offense,” Women and Language19:2).

Use evidence

In the example above, the writers refer to several other sources when making their point. A literature review in this sense is just like any other academic research paper. Your interpretation of the available sources must be backed up with evidence to show that what you are saying is valid.

Be selective

Select only the most important points in each source to highlight in the review. The type of information you choose to mention should relate directly to the review’s focus, whether it is thematic, methodological, or chronological.

Use quotes sparingly

Falk and Mills do not use any direct quotes. That is because the survey nature of the literature review does not allow for in-depth discussion or detailed quotes from the text. Some short quotes here and there are okay, though, if you want to emphasize a point, or if what the author said just cannot be rewritten in your own words. Notice that Falk and Mills do quote certain terms that were coined by the author, not common knowledge, or taken directly from the study. But if you find yourself wanting to put in more quotes, check with your instructor.

Summarize and synthesize

Remember to summarize and synthesize your sources within each paragraph as well as throughout the review. The authors here recapitulate important features of Hamilton’s study, but then synthesize it by rephrasing the study’s significance and relating it to their own work.

Keep your own voice

While the literature review presents others’ ideas, your voice (the writer’s) should remain front and center. Notice that Falk and Mills weave references to other sources into their own text, but they still maintain their own voice by starting and ending the paragraph with their own ideas and their own words. The sources support what Falk and Mills are saying.

Use caution when paraphrasing

When paraphrasing a source that is not your own, be sure to represent the author’s information or opinions accurately and in your own words. In the preceding example, Falk and Mills either directly refer in the text to the author of their source, such as Hamilton, or they provide ample notation in the text when the ideas they are mentioning are not their own, for example, Gastil’s. For more information, please see our handout on plagiarism .

Revise, revise, revise

Draft in hand? Now you’re ready to revise. Spending a lot of time revising is a wise idea, because your main objective is to present the material, not the argument. So check over your review again to make sure it follows the assignment and/or your outline. Then, just as you would for most other academic forms of writing, rewrite or rework the language of your review so that you’ve presented your information in the most concise manner possible. Be sure to use terminology familiar to your audience; get rid of unnecessary jargon or slang. Finally, double check that you’ve documented your sources and formatted the review appropriately for your discipline. For tips on the revising and editing process, see our handout on revising drafts .

Works consulted

We consulted these works while writing this handout. This is not a comprehensive list of resources on the handout’s topic, and we encourage you to do your own research to find additional publications. Please do not use this list as a model for the format of your own reference list, as it may not match the citation style you are using. For guidance on formatting citations, please see the UNC Libraries citation tutorial . We revise these tips periodically and welcome feedback.

Anson, Chris M., and Robert A. Schwegler. 2010. The Longman Handbook for Writers and Readers , 6th ed. New York: Longman.

Jones, Robert, Patrick Bizzaro, and Cynthia Selfe. 1997. The Harcourt Brace Guide to Writing in the Disciplines . New York: Harcourt Brace.

Lamb, Sandra E. 1998. How to Write It: A Complete Guide to Everything You’ll Ever Write . Berkeley: Ten Speed Press.

Rosen, Leonard J., and Laurence Behrens. 2003. The Allyn & Bacon Handbook , 5th ed. New York: Longman.

Troyka, Lynn Quittman, and Doug Hesse. 2016. Simon and Schuster Handbook for Writers , 11th ed. London: Pearson.

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Writing Help: Grammar, Style & Structure

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Also referred to as a book report, a  book review  consists of "critical comments on a book, especially when it is first published" ("Book Review, 2006). 

Similar to a short essay, a book review typically includes several of these elements:

Book Review. (2006). In P. Collin (Ed.),  Dictionary of publishing and printing . London, United Kingdom: A&C Black. Retrieved from http://search.credoreference.com

Follow these links to learn more about book reviews:

A literature review is a "comprehensive study and interpretation of literature that addresses a specific topic" (Aveyard, 2010).

Literature reviews are generally conducted in one of two ways:

1) As a preliminary review before a larger study in order to critically evaluate the current literature and justify why further study and research is required.

In this case, the researcher must "systematically search, critique and combine the literature to demonstrate a gap in the existing research base" while demonstrating "their understanding of both the research and the methods previously used to investigate the area" (Aveyard, 2010).

2) As a project in itself that provides a comprehensive survey of the works published in a particular discipline or area of research over a specified period of time.

Sometimes referred to as a systematic literature review or meta-analysis, this type of literature review is a critical survey that attempts to "evaluate and interpret all available research evidence relevant to a particular question" (Glasziou, 2001).

Aveyard, H. (2010). Doing a literature review in health and social care: A practical guide (2nd ed.). Bershire, United Kingdom: Open University Press.

Galsziou, P. (2001). Systematic reviews in health care: A practical guide . New York, NY: Cambridge University Press.

Learn more about literature reviews:

Trulli

Literature Review: Literature Review

Literature Review Learning to write a structured review of literature

What is a Literature Review?

A Literature Review is a systematic and comprehensive analysis of books, scholarly articles, and other sources relevant to a specific topic providing a base of knowledge on a topic. Literature reviews are designed to identify and critique the existing literature on a topic to justify your research by exposing gaps in current research.  This investigation should provide a description, summary, and critical evaluation of works related to the research problem and should also add to the overall knowledge of the topic as well as demonstrating how your research will fit within a larger field of study.  A literature review should offer a  critical analysis of the current research on a topic and that analysis should direct your research objective. This should not be confused with a book review or an annotated bibliography both research tools but very different in purpose and scope.  A Literature Review can be a stand-alone element or part of a larger end product, know your assignment.  The key to a good Literature Review is to document your process .

Basics of a Literature Review

17 - what is a literature review from Joshua Vossler on Vimeo .

This guide is a curated collection of materials from around the internet used with permission: including videos,  infographics, text blocks, and other materials when citing the entire guide use: 

Karas, Laura B. “Literature Review.” LibGuides , University of South Carolina Upstate, https://uscupstate.libguides.com/Literature_Review.

When citing an element such as an individual video, or infographic use the original source, that is linked back such as:

Vossler, Joshua, director. What Is a Literature Review . Vimeo , University of West Florida, 2014, https://vimeo.com/90324266. Accessed 29 June 2022.

There are many different ways to organize your references in a literature review, but most reviews contain certain basic elements.

Literature Reviews: Common Errors Made When Conducting a Literature Review

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What is a Literature Review?

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Learn the basics about writing a literature review

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If you've ever written a research paper , it's likely you've done some form of literature review. A literature review is a survey of current books and articles on a particular topic. While they may sound tedious, literature reviews are helpful windows into the cutting edge of any field.

Literature reviews are often closely associated with annotated bibliographies, which also list and analyze scholarly sources. However, unlike an annotated bibliography, a literature review is usually written in the form of an essay, with full paragraphs, an introduction, and a conclusion. Literature reviews also differ from book reviews , despite their similar names, since they focus on bodies of work rather than singular sources.

Why are literature reviews important?

Doing a literature review is the first step to writing a great research paper. Whether you know a lot about a topic or only a little, a literature review will help familiarize you with the most important scholars, themes, and sources in the field.

Writing a literature review can also help you build a solid thesis before you tackle the rest of an essay. Even if you've selected an interesting topic, articulating a great argument can be trickier than you think. Often, students realize that their thesis is untenable halfway through writing their papers, usually because there aren't enough sources to support their arguments. By carrying out a literature review, you'll build an inventory of research that you can use at any point in the writing process.

Since most researchers draw on networks of other scholarship, reviewing literature can also help you find sources that you didn't know about before. For example, the citations in a journal article or book often direct you to seminal works in the field. Even if you can't read every last paper, a literature review will leave you better informed about where to turn if you need more information.

What are the stages of writing a literature review?

Poring over books and articles for a literature review takes some dedication. By dividing up your work into four different steps, you'll save time and finish your review faster.

1) Research

A thorough amount of research is a prerequisite for writing a good literature review. In the research stage, you should visit a library or browse a journal database to begin collecting your sources. Start by searching for a broad topic and hone in on your research question as you become more confident about your subject.

2) Consolidation of information

Next, you should compile all the information that you've gleaned from your research. Aim to organize your notes in a way that's logical, such as thematically or chronologically. It may be helpful to use visual aids, such as charts or graphs, to keep track of all the sources you’ve surveyed. For every book or article, make note of the full author's name, title, and publishing information, so that you can use these details in your bibliography .

3) Analysis

Now you can go back over the data that you've collected and look for connections between sources and your research question. You can also expand your notes from the consolidation phase and categorize each source by the author's main argument and type of evidence. This will help simplify your analysis and make it easier to draw conclusions in your literature review.

4) Presentation

The final stage is when you put everything you know onto paper. Introduce readers to your research question and lead them through existing scholarly works, starting with the most impactful and important sources. Don’t forget to write an introduction , make transitions between paragraphs, and present a conclusion. 

Putting the final touches on your literature review

After reading our guide, you may still have questions about perfecting your literature review. Our academic editors are happy to help—don't hesitate to contact us!

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"The Complete Beginner's Guide to Academic Writing"

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The Literature Review: For Dissertations

Recommended Books on Literature Review

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Recommended Books on Dissertation Writing

How-to books may help to get you started but there is no perfect process for writing your dissertation. Consider reading this article: 

Kamler, B. & Thomson, P. (2008). The failure of dissertation advice books: Toward alternative pedagogies for doctoral writing . Educational Researcher  (8), 507.  doi: 10.3102/0013189X08327390

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Lau F, Kuziemsky C, editors. Handbook of eHealth Evaluation: An Evidence-based Approach [Internet]. Victoria (BC): University of Victoria; 2017 Feb 27.

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Handbook of eHealth Evaluation: An Evidence-based Approach [Internet].

Chapter 9 methods for literature reviews.

Guy Paré and Spyros Kitsiou .

9.1. Introduction

Literature reviews play a critical role in scholarship because science remains, first and foremost, a cumulative endeavour ( vom Brocke et al., 2009 ). As in any academic discipline, rigorous knowledge syntheses are becoming indispensable in keeping up with an exponentially growing eHealth literature, assisting practitioners, academics, and graduate students in finding, evaluating, and synthesizing the contents of many empirical and conceptual papers. Among other methods, literature reviews are essential for: (a) identifying what has been written on a subject or topic; (b) determining the extent to which a specific research area reveals any interpretable trends or patterns; (c) aggregating empirical findings related to a narrow research question to support evidence-based practice; (d) generating new frameworks and theories; and (e) identifying topics or questions requiring more investigation ( Paré, Trudel, Jaana, & Kitsiou, 2015 ).

Literature reviews can take two major forms. The most prevalent one is the “literature review” or “background” section within a journal paper or a chapter in a graduate thesis. This section synthesizes the extant literature and usually identifies the gaps in knowledge that the empirical study addresses ( Sylvester, Tate, & Johnstone, 2013 ). It may also provide a theoretical foundation for the proposed study, substantiate the presence of the research problem, justify the research as one that contributes something new to the cumulated knowledge, or validate the methods and approaches for the proposed study ( Hart, 1998 ; Levy & Ellis, 2006 ).

The second form of literature review, which is the focus of this chapter, constitutes an original and valuable work of research in and of itself ( Paré et al., 2015 ). Rather than providing a base for a researcher’s own work, it creates a solid starting point for all members of the community interested in a particular area or topic ( Mulrow, 1987 ). The so-called “review article” is a journal-length paper which has an overarching purpose to synthesize the literature in a field, without collecting or analyzing any primary data ( Green, Johnson, & Adams, 2006 ).

When appropriately conducted, review articles represent powerful information sources for practitioners looking for state-of-the art evidence to guide their decision-making and work practices ( Paré et al., 2015 ). Further, high-quality reviews become frequently cited pieces of work which researchers seek out as a first clear outline of the literature when undertaking empirical studies ( Cooper, 1988 ; Rowe, 2014 ). Scholars who track and gauge the impact of articles have found that review papers are cited and downloaded more often than any other type of published article ( Cronin, Ryan, & Coughlan, 2008 ; Montori, Wilczynski, Morgan, Haynes, & Hedges, 2003 ; Patsopoulos, Analatos, & Ioannidis, 2005 ). The reason for their popularity may be the fact that reading the review enables one to have an overview, if not a detailed knowledge of the area in question, as well as references to the most useful primary sources ( Cronin et al., 2008 ). Although they are not easy to conduct, the commitment to complete a review article provides a tremendous service to one’s academic community ( Paré et al., 2015 ; Petticrew & Roberts, 2006 ). Most, if not all, peer-reviewed journals in the fields of medical informatics publish review articles of some type.

The main objectives of this chapter are fourfold: (a) to provide an overview of the major steps and activities involved in conducting a stand-alone literature review; (b) to describe and contrast the different types of review articles that can contribute to the eHealth knowledge base; (c) to illustrate each review type with one or two examples from the eHealth literature; and (d) to provide a series of recommendations for prospective authors of review articles in this domain.

9.2. Overview of the Literature Review Process and Steps

As explained in Templier and Paré (2015) , there are six generic steps involved in conducting a review article:

Although these steps are presented here in sequential order, one must keep in mind that the review process can be iterative and that many activities can be initiated during the planning stage and later refined during subsequent phases ( Finfgeld-Connett & Johnson, 2013 ; Kitchenham & Charters, 2007 ).

Formulating the research question(s) and objective(s): As a first step, members of the review team must appropriately justify the need for the review itself ( Petticrew & Roberts, 2006 ), identify the review’s main objective(s) ( Okoli & Schabram, 2010 ), and define the concepts or variables at the heart of their synthesis ( Cooper & Hedges, 2009 ; Webster & Watson, 2002 ). Importantly, they also need to articulate the research question(s) they propose to investigate ( Kitchenham & Charters, 2007 ). In this regard, we concur with Jesson, Matheson, and Lacey (2011) that clearly articulated research questions are key ingredients that guide the entire review methodology; they underscore the type of information that is needed, inform the search for and selection of relevant literature, and guide or orient the subsequent analysis. Searching the extant literature: The next step consists of searching the literature and making decisions about the suitability of material to be considered in the review ( Cooper, 1988 ). There exist three main coverage strategies. First, exhaustive coverage means an effort is made to be as comprehensive as possible in order to ensure that all relevant studies, published and unpublished, are included in the review and, thus, conclusions are based on this all-inclusive knowledge base. The second type of coverage consists of presenting materials that are representative of most other works in a given field or area. Often authors who adopt this strategy will search for relevant articles in a small number of top-tier journals in a field ( Paré et al., 2015 ). In the third strategy, the review team concentrates on prior works that have been central or pivotal to a particular topic. This may include empirical studies or conceptual papers that initiated a line of investigation, changed how problems or questions were framed, introduced new methods or concepts, or engendered important debate ( Cooper, 1988 ). Screening for inclusion: The following step consists of evaluating the applicability of the material identified in the preceding step ( Levy & Ellis, 2006 ; vom Brocke et al., 2009 ). Once a group of potential studies has been identified, members of the review team must screen them to determine their relevance ( Petticrew & Roberts, 2006 ). A set of predetermined rules provides a basis for including or excluding certain studies. This exercise requires a significant investment on the part of researchers, who must ensure enhanced objectivity and avoid biases or mistakes. As discussed later in this chapter, for certain types of reviews there must be at least two independent reviewers involved in the screening process and a procedure to resolve disagreements must also be in place ( Liberati et al., 2009 ; Shea et al., 2009 ). Assessing the quality of primary studies: In addition to screening material for inclusion, members of the review team may need to assess the scientific quality of the selected studies, that is, appraise the rigour of the research design and methods. Such formal assessment, which is usually conducted independently by at least two coders, helps members of the review team refine which studies to include in the final sample, determine whether or not the differences in quality may affect their conclusions, or guide how they analyze the data and interpret the findings ( Petticrew & Roberts, 2006 ). Ascribing quality scores to each primary study or considering through domain-based evaluations which study components have or have not been designed and executed appropriately makes it possible to reflect on the extent to which the selected study addresses possible biases and maximizes validity ( Shea et al., 2009 ). Extracting data: The following step involves gathering or extracting applicable information from each primary study included in the sample and deciding what is relevant to the problem of interest ( Cooper & Hedges, 2009 ). Indeed, the type of data that should be recorded mainly depends on the initial research questions ( Okoli & Schabram, 2010 ). However, important information may also be gathered about how, when, where and by whom the primary study was conducted, the research design and methods, or qualitative/quantitative results ( Cooper & Hedges, 2009 ). Analyzing and synthesizing data : As a final step, members of the review team must collate, summarize, aggregate, organize, and compare the evidence extracted from the included studies. The extracted data must be presented in a meaningful way that suggests a new contribution to the extant literature ( Jesson et al., 2011 ). Webster and Watson (2002) warn researchers that literature reviews should be much more than lists of papers and should provide a coherent lens to make sense of extant knowledge on a given topic. There exist several methods and techniques for synthesizing quantitative (e.g., frequency analysis, meta-analysis) and qualitative (e.g., grounded theory, narrative analysis, meta-ethnography) evidence ( Dixon-Woods, Agarwal, Jones, Young, & Sutton, 2005 ; Thomas & Harden, 2008 ).

9.3. Types of Review Articles and Brief Illustrations

EHealth researchers have at their disposal a number of approaches and methods for making sense out of existing literature, all with the purpose of casting current research findings into historical contexts or explaining contradictions that might exist among a set of primary research studies conducted on a particular topic. Our classification scheme is largely inspired from Paré and colleagues’ (2015) typology. Below we present and illustrate those review types that we feel are central to the growth and development of the eHealth domain.

9.3.1. Narrative Reviews

The narrative review is the “traditional” way of reviewing the extant literature and is skewed towards a qualitative interpretation of prior knowledge ( Sylvester et al., 2013 ). Put simply, a narrative review attempts to summarize or synthesize what has been written on a particular topic but does not seek generalization or cumulative knowledge from what is reviewed ( Davies, 2000 ; Green et al., 2006 ). Instead, the review team often undertakes the task of accumulating and synthesizing the literature to demonstrate the value of a particular point of view ( Baumeister & Leary, 1997 ). As such, reviewers may selectively ignore or limit the attention paid to certain studies in order to make a point. In this rather unsystematic approach, the selection of information from primary articles is subjective, lacks explicit criteria for inclusion and can lead to biased interpretations or inferences ( Green et al., 2006 ). There are several narrative reviews in the particular eHealth domain, as in all fields, which follow such an unstructured approach ( Silva et al., 2015 ; Paul et al., 2015 ).

Despite these criticisms, this type of review can be very useful in gathering together a volume of literature in a specific subject area and synthesizing it. As mentioned above, its primary purpose is to provide the reader with a comprehensive background for understanding current knowledge and highlighting the significance of new research ( Cronin et al., 2008 ). Faculty like to use narrative reviews in the classroom because they are often more up to date than textbooks, provide a single source for students to reference, and expose students to peer-reviewed literature ( Green et al., 2006 ). For researchers, narrative reviews can inspire research ideas by identifying gaps or inconsistencies in a body of knowledge, thus helping researchers to determine research questions or formulate hypotheses. Importantly, narrative reviews can also be used as educational articles to bring practitioners up to date with certain topics of issues ( Green et al., 2006 ).

Recently, there have been several efforts to introduce more rigour in narrative reviews that will elucidate common pitfalls and bring changes into their publication standards. Information systems researchers, among others, have contributed to advancing knowledge on how to structure a “traditional” review. For instance, Levy and Ellis (2006) proposed a generic framework for conducting such reviews. Their model follows the systematic data processing approach comprised of three steps, namely: (a) literature search and screening; (b) data extraction and analysis; and (c) writing the literature review. They provide detailed and very helpful instructions on how to conduct each step of the review process. As another methodological contribution, vom Brocke et al. (2009) offered a series of guidelines for conducting literature reviews, with a particular focus on how to search and extract the relevant body of knowledge. Last, Bandara, Miskon, and Fielt (2011) proposed a structured, predefined and tool-supported method to identify primary studies within a feasible scope, extract relevant content from identified articles, synthesize and analyze the findings, and effectively write and present the results of the literature review. We highly recommend that prospective authors of narrative reviews consult these useful sources before embarking on their work.

Darlow and Wen (2015) provide a good example of a highly structured narrative review in the eHealth field. These authors synthesized published articles that describe the development process of mobile health ( m-health ) interventions for patients’ cancer care self-management. As in most narrative reviews, the scope of the research questions being investigated is broad: (a) how development of these systems are carried out; (b) which methods are used to investigate these systems; and (c) what conclusions can be drawn as a result of the development of these systems. To provide clear answers to these questions, a literature search was conducted on six electronic databases and Google Scholar . The search was performed using several terms and free text words, combining them in an appropriate manner. Four inclusion and three exclusion criteria were utilized during the screening process. Both authors independently reviewed each of the identified articles to determine eligibility and extract study information. A flow diagram shows the number of studies identified, screened, and included or excluded at each stage of study selection. In terms of contributions, this review provides a series of practical recommendations for m-health intervention development.

9.3.2. Descriptive or Mapping Reviews

The primary goal of a descriptive review is to determine the extent to which a body of knowledge in a particular research topic reveals any interpretable pattern or trend with respect to pre-existing propositions, theories, methodologies or findings ( King & He, 2005 ; Paré et al., 2015 ). In contrast with narrative reviews, descriptive reviews follow a systematic and transparent procedure, including searching, screening and classifying studies ( Petersen, Vakkalanka, & Kuzniarz, 2015 ). Indeed, structured search methods are used to form a representative sample of a larger group of published works ( Paré et al., 2015 ). Further, authors of descriptive reviews extract from each study certain characteristics of interest, such as publication year, research methods, data collection techniques, and direction or strength of research outcomes (e.g., positive, negative, or non-significant) in the form of frequency analysis to produce quantitative results ( Sylvester et al., 2013 ). In essence, each study included in a descriptive review is treated as the unit of analysis and the published literature as a whole provides a database from which the authors attempt to identify any interpretable trends or draw overall conclusions about the merits of existing conceptualizations, propositions, methods or findings ( Paré et al., 2015 ). In doing so, a descriptive review may claim that its findings represent the state of the art in a particular domain ( King & He, 2005 ).

In the fields of health sciences and medical informatics, reviews that focus on examining the range, nature and evolution of a topic area are described by Anderson, Allen, Peckham, and Goodwin (2008) as mapping reviews . Like descriptive reviews, the research questions are generic and usually relate to publication patterns and trends. There is no preconceived plan to systematically review all of the literature although this can be done. Instead, researchers often present studies that are representative of most works published in a particular area and they consider a specific time frame to be mapped.

An example of this approach in the eHealth domain is offered by DeShazo, Lavallie, and Wolf (2009). The purpose of this descriptive or mapping review was to characterize publication trends in the medical informatics literature over a 20-year period (1987 to 2006). To achieve this ambitious objective, the authors performed a bibliometric analysis of medical informatics citations indexed in medline using publication trends, journal frequencies, impact factors, Medical Subject Headings (MeSH) term frequencies, and characteristics of citations. Findings revealed that there were over 77,000 medical informatics articles published during the covered period in numerous journals and that the average annual growth rate was 12%. The MeSH term analysis also suggested a strong interdisciplinary trend. Finally, average impact scores increased over time with two notable growth periods. Overall, patterns in research outputs that seem to characterize the historic trends and current components of the field of medical informatics suggest it may be a maturing discipline (DeShazo et al., 2009).

9.3.3. Scoping Reviews

Scoping reviews attempt to provide an initial indication of the potential size and nature of the extant literature on an emergent topic (Arksey & O’Malley, 2005; Daudt, van Mossel, & Scott, 2013 ; Levac, Colquhoun, & O’Brien, 2010). A scoping review may be conducted to examine the extent, range and nature of research activities in a particular area, determine the value of undertaking a full systematic review (discussed next), or identify research gaps in the extant literature ( Paré et al., 2015 ). In line with their main objective, scoping reviews usually conclude with the presentation of a detailed research agenda for future works along with potential implications for both practice and research.

Unlike narrative and descriptive reviews, the whole point of scoping the field is to be as comprehensive as possible, including grey literature (Arksey & O’Malley, 2005). Inclusion and exclusion criteria must be established to help researchers eliminate studies that are not aligned with the research questions. It is also recommended that at least two independent coders review abstracts yielded from the search strategy and then the full articles for study selection ( Daudt et al., 2013 ). The synthesized evidence from content or thematic analysis is relatively easy to present in tabular form (Arksey & O’Malley, 2005; Thomas & Harden, 2008 ).

One of the most highly cited scoping reviews in the eHealth domain was published by Archer, Fevrier-Thomas, Lokker, McKibbon, and Straus (2011) . These authors reviewed the existing literature on personal health record ( phr ) systems including design, functionality, implementation, applications, outcomes, and benefits. Seven databases were searched from 1985 to March 2010. Several search terms relating to phr s were used during this process. Two authors independently screened titles and abstracts to determine inclusion status. A second screen of full-text articles, again by two independent members of the research team, ensured that the studies described phr s. All in all, 130 articles met the criteria and their data were extracted manually into a database. The authors concluded that although there is a large amount of survey, observational, cohort/panel, and anecdotal evidence of phr benefits and satisfaction for patients, more research is needed to evaluate the results of phr implementations. Their in-depth analysis of the literature signalled that there is little solid evidence from randomized controlled trials or other studies through the use of phr s. Hence, they suggested that more research is needed that addresses the current lack of understanding of optimal functionality and usability of these systems, and how they can play a beneficial role in supporting patient self-management ( Archer et al., 2011 ).

9.3.4. Forms of Aggregative Reviews

Healthcare providers, practitioners, and policy-makers are nowadays overwhelmed with large volumes of information, including research-based evidence from numerous clinical trials and evaluation studies, assessing the effectiveness of health information technologies and interventions ( Ammenwerth & de Keizer, 2004 ; Deshazo et al., 2009 ). It is unrealistic to expect that all these disparate actors will have the time, skills, and necessary resources to identify the available evidence in the area of their expertise and consider it when making decisions. Systematic reviews that involve the rigorous application of scientific strategies aimed at limiting subjectivity and bias (i.e., systematic and random errors) can respond to this challenge.

Systematic reviews attempt to aggregate, appraise, and synthesize in a single source all empirical evidence that meet a set of previously specified eligibility criteria in order to answer a clearly formulated and often narrow research question on a particular topic of interest to support evidence-based practice ( Liberati et al., 2009 ). They adhere closely to explicit scientific principles ( Liberati et al., 2009 ) and rigorous methodological guidelines (Higgins & Green, 2008) aimed at reducing random and systematic errors that can lead to deviations from the truth in results or inferences. The use of explicit methods allows systematic reviews to aggregate a large body of research evidence, assess whether effects or relationships are in the same direction and of the same general magnitude, explain possible inconsistencies between study results, and determine the strength of the overall evidence for every outcome of interest based on the quality of included studies and the general consistency among them ( Cook, Mulrow, & Haynes, 1997 ). The main procedures of a systematic review involve:

Many systematic reviews, but not all, use statistical methods to combine the results of independent studies into a single quantitative estimate or summary effect size. Known as meta-analyses , these reviews use specific data extraction and statistical techniques (e.g., network, frequentist, or Bayesian meta-analyses) to calculate from each study by outcome of interest an effect size along with a confidence interval that reflects the degree of uncertainty behind the point estimate of effect ( Borenstein, Hedges, Higgins, & Rothstein, 2009 ; Deeks, Higgins, & Altman, 2008 ). Subsequently, they use fixed or random-effects analysis models to combine the results of the included studies, assess statistical heterogeneity, and calculate a weighted average of the effect estimates from the different studies, taking into account their sample sizes. The summary effect size is a value that reflects the average magnitude of the intervention effect for a particular outcome of interest or, more generally, the strength of a relationship between two variables across all studies included in the systematic review. By statistically combining data from multiple studies, meta-analyses can create more precise and reliable estimates of intervention effects than those derived from individual studies alone, when these are examined independently as discrete sources of information.

The review by Gurol-Urganci, de Jongh, Vodopivec-Jamsek, Atun, and Car (2013) on the effects of mobile phone messaging reminders for attendance at healthcare appointments is an illustrative example of a high-quality systematic review with meta-analysis. Missed appointments are a major cause of inefficiency in healthcare delivery with substantial monetary costs to health systems. These authors sought to assess whether mobile phone-based appointment reminders delivered through Short Message Service ( sms ) or Multimedia Messaging Service ( mms ) are effective in improving rates of patient attendance and reducing overall costs. To this end, they conducted a comprehensive search on multiple databases using highly sensitive search strategies without language or publication-type restrictions to identify all rct s that are eligible for inclusion. In order to minimize the risk of omitting eligible studies not captured by the original search, they supplemented all electronic searches with manual screening of trial registers and references contained in the included studies. Study selection, data extraction, and risk of bias assessments were performed inde­­pen­dently by two coders using standardized methods to ensure consistency and to eliminate potential errors. Findings from eight rct s involving 6,615 participants were pooled into meta-analyses to calculate the magnitude of effects that mobile text message reminders have on the rate of attendance at healthcare appointments compared to no reminders and phone call reminders.

Meta-analyses are regarded as powerful tools for deriving meaningful conclusions. However, there are situations in which it is neither reasonable nor appropriate to pool studies together using meta-analytic methods simply because there is extensive clinical heterogeneity between the included studies or variation in measurement tools, comparisons, or outcomes of interest. In these cases, systematic reviews can use qualitative synthesis methods such as vote counting, content analysis, classification schemes and tabulations, as an alternative approach to narratively synthesize the results of the independent studies included in the review. This form of review is known as qualitative systematic review.

A rigorous example of one such review in the eHealth domain is presented by Mickan, Atherton, Roberts, Heneghan, and Tilson (2014) on the use of handheld computers by healthcare professionals and their impact on access to information and clinical decision-making. In line with the methodological guide­lines for systematic reviews, these authors: (a) developed and registered with prospero ( www.crd.york.ac.uk/ prospero / ) an a priori review protocol; (b) conducted comprehensive searches for eligible studies using multiple databases and other supplementary strategies (e.g., forward searches); and (c) subsequently carried out study selection, data extraction, and risk of bias assessments in a duplicate manner to eliminate potential errors in the review process. Heterogeneity between the included studies in terms of reported outcomes and measures precluded the use of meta-analytic methods. To this end, the authors resorted to using narrative analysis and synthesis to describe the effectiveness of handheld computers on accessing information for clinical knowledge, adherence to safety and clinical quality guidelines, and diagnostic decision-making.

In recent years, the number of systematic reviews in the field of health informatics has increased considerably. Systematic reviews with discordant findings can cause great confusion and make it difficult for decision-makers to interpret the review-level evidence ( Moher, 2013 ). Therefore, there is a growing need for appraisal and synthesis of prior systematic reviews to ensure that decision-making is constantly informed by the best available accumulated evidence. Umbrella reviews , also known as overviews of systematic reviews, are tertiary types of evidence synthesis that aim to accomplish this; that is, they aim to compare and contrast findings from multiple systematic reviews and meta-analyses ( Becker & Oxman, 2008 ). Umbrella reviews generally adhere to the same principles and rigorous methodological guidelines used in systematic reviews. However, the unit of analysis in umbrella reviews is the systematic review rather than the primary study ( Becker & Oxman, 2008 ). Unlike systematic reviews that have a narrow focus of inquiry, umbrella reviews focus on broader research topics for which there are several potential interventions ( Smith, Devane, Begley, & Clarke, 2011 ). A recent umbrella review on the effects of home telemonitoring interventions for patients with heart failure critically appraised, compared, and synthesized evidence from 15 systematic reviews to investigate which types of home telemonitoring technologies and forms of interventions are more effective in reducing mortality and hospital admissions ( Kitsiou, Paré, & Jaana, 2015 ).

9.3.5. Realist Reviews

Realist reviews are theory-driven interpretative reviews developed to inform, enhance, or supplement conventional systematic reviews by making sense of heterogeneous evidence about complex interventions applied in diverse contexts in a way that informs policy decision-making ( Greenhalgh, Wong, Westhorp, & Pawson, 2011 ). They originated from criticisms of positivist systematic reviews which centre on their “simplistic” underlying assumptions ( Oates, 2011 ). As explained above, systematic reviews seek to identify causation. Such logic is appropriate for fields like medicine and education where findings of randomized controlled trials can be aggregated to see whether a new treatment or intervention does improve outcomes. However, many argue that it is not possible to establish such direct causal links between interventions and outcomes in fields such as social policy, management, and information systems where for any intervention there is unlikely to be a regular or consistent outcome ( Oates, 2011 ; Pawson, 2006 ; Rousseau, Manning, & Denyer, 2008 ).

To circumvent these limitations, Pawson, Greenhalgh, Harvey, and Walshe (2005) have proposed a new approach for synthesizing knowledge that seeks to unpack the mechanism of how “complex interventions” work in particular contexts. The basic research question — what works? — which is usually associated with systematic reviews changes to: what is it about this intervention that works, for whom, in what circumstances, in what respects and why? Realist reviews have no particular preference for either quantitative or qualitative evidence. As a theory-building approach, a realist review usually starts by articulating likely underlying mechanisms and then scrutinizes available evidence to find out whether and where these mechanisms are applicable ( Shepperd et al., 2009 ). Primary studies found in the extant literature are viewed as case studies which can test and modify the initial theories ( Rousseau et al., 2008 ).

The main objective pursued in the realist review conducted by Otte-Trojel, de Bont, Rundall, and van de Klundert (2014) was to examine how patient portals contribute to health service delivery and patient outcomes. The specific goals were to investigate how outcomes are produced and, most importantly, how variations in outcomes can be explained. The research team started with an exploratory review of background documents and research studies to identify ways in which patient portals may contribute to health service delivery and patient outcomes. The authors identified six main ways which represent “educated guesses” to be tested against the data in the evaluation studies. These studies were identified through a formal and systematic search in four databases between 2003 and 2013. Two members of the research team selected the articles using a pre-established list of inclusion and exclusion criteria and following a two-step procedure. The authors then extracted data from the selected articles and created several tables, one for each outcome category. They organized information to bring forward those mechanisms where patient portals contribute to outcomes and the variation in outcomes across different contexts.

9.3.6. Critical Reviews

Lastly, critical reviews aim to provide a critical evaluation and interpretive analysis of existing literature on a particular topic of interest to reveal strengths, weaknesses, contradictions, controversies, inconsistencies, and/or other important issues with respect to theories, hypotheses, research methods or results ( Baumeister & Leary, 1997 ; Kirkevold, 1997 ). Unlike other review types, critical reviews attempt to take a reflective account of the research that has been done in a particular area of interest, and assess its credibility by using appraisal instruments or critical interpretive methods. In this way, critical reviews attempt to constructively inform other scholars about the weaknesses of prior research and strengthen knowledge development by giving focus and direction to studies for further improvement ( Kirkevold, 1997 ).

Kitsiou, Paré, and Jaana (2013) provide an example of a critical review that assessed the methodological quality of prior systematic reviews of home telemonitoring studies for chronic patients. The authors conducted a comprehensive search on multiple databases to identify eligible reviews and subsequently used a validated instrument to conduct an in-depth quality appraisal. Results indicate that the majority of systematic reviews in this particular area suffer from important methodological flaws and biases that impair their internal validity and limit their usefulness for clinical and decision-making purposes. To this end, they provide a number of recommendations to strengthen knowledge development towards improving the design and execution of future reviews on home telemonitoring.

9.4. Summary

Table 9.1 outlines the main types of literature reviews that were described in the previous sub-sections and summarizes the main characteristics that distinguish one review type from another. It also includes key references to methodological guidelines and useful sources that can be used by eHealth scholars and researchers for planning and developing reviews.

Table 9.1. Typology of Literature Reviews (adapted from Paré et al., 2015).

Typology of Literature Reviews (adapted from Paré et al., 2015).

As shown in Table 9.1 , each review type addresses different kinds of research questions or objectives, which subsequently define and dictate the methods and approaches that need to be used to achieve the overarching goal(s) of the review. For example, in the case of narrative reviews, there is greater flexibility in searching and synthesizing articles ( Green et al., 2006 ). Researchers are often relatively free to use a diversity of approaches to search, identify, and select relevant scientific articles, describe their operational characteristics, present how the individual studies fit together, and formulate conclusions. On the other hand, systematic reviews are characterized by their high level of systematicity, rigour, and use of explicit methods, based on an “a priori” review plan that aims to minimize bias in the analysis and synthesis process (Higgins & Green, 2008). Some reviews are exploratory in nature (e.g., scoping/mapping reviews), whereas others may be conducted to discover patterns (e.g., descriptive reviews) or involve a synthesis approach that may include the critical analysis of prior research ( Paré et al., 2015 ). Hence, in order to select the most appropriate type of review, it is critical to know before embarking on a review project, why the research synthesis is conducted and what type of methods are best aligned with the pursued goals.

9.5. Concluding Remarks

In light of the increased use of evidence-based practice and research generating stronger evidence ( Grady et al., 2011 ; Lyden et al., 2013 ), review articles have become essential tools for summarizing, synthesizing, integrating or critically appraising prior knowledge in the eHealth field. As mentioned earlier, when rigorously conducted review articles represent powerful information sources for eHealth scholars and practitioners looking for state-of-the-art evidence. The typology of literature reviews we used herein will allow eHealth researchers, graduate students and practitioners to gain a better understanding of the similarities and differences between review types.

We must stress that this classification scheme does not privilege any specific type of review as being of higher quality than another ( Paré et al., 2015 ). As explained above, each type of review has its own strengths and limitations. Having said that, we realize that the methodological rigour of any review — be it qualitative, quantitative or mixed — is a critical aspect that should be considered seriously by prospective authors. In the present context, the notion of rigour refers to the reliability and validity of the review process described in section 9.2. For one thing, reliability is related to the reproducibility of the review process and steps, which is facilitated by a comprehensive documentation of the literature search process, extraction, coding and analysis performed in the review. Whether the search is comprehensive or not, whether it involves a methodical approach for data extraction and synthesis or not, it is important that the review documents in an explicit and transparent manner the steps and approach that were used in the process of its development. Next, validity characterizes the degree to which the review process was conducted appropriately. It goes beyond documentation and reflects decisions related to the selection of the sources, the search terms used, the period of time covered, the articles selected in the search, and the application of backward and forward searches ( vom Brocke et al., 2009 ). In short, the rigour of any review article is reflected by the explicitness of its methods (i.e., transparency) and the soundness of the approach used. We refer those interested in the concepts of rigour and quality to the work of Templier and Paré (2015) which offers a detailed set of methodological guidelines for conducting and evaluating various types of review articles.

To conclude, our main objective in this chapter was to demystify the various types of literature reviews that are central to the continuous development of the eHealth field. It is our hope that our descriptive account will serve as a valuable source for those conducting, evaluating or using reviews in this important and growing domain.

This publication is licensed under a Creative Commons License, Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0): see https://creativecommons.org/licenses/by-nc/4.0/

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Literature Review

About this guide

This research guide was developed for students at Bloomsburg University of Pennsylvania.

If you are a student from another school, you are welcome to peruse the guide, using the links above, but please know that our librarians can only provide general help to non-BU students. Contact the librarians at your own institution for help in using the resources available to you.

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A literature review is a comprehensive summary of previous research on a topic. The literature review surveys scholarly articles, books, and other sources relevant to a particular area of research.  The review should enumerate, describe, summarize, objectively evaluate and clarify this previous research.  It should give a theoretical base for the research and help you (the author) determine the nature of your research.  The literature review acknowledges the work of previous researchers, and in so doing, assures the reader that your work has been well conceived.  It is assumed that by mentioning a previous work in the field of study, that the author has read, evaluated, and assimiliated that work into the work at hand.

A literature review creates a "landscape" for the reader, giving her or him a full understanding of the developments in the field.  This landscape informs the reader that the author has indeed assimilated all (or the vast majority of) previous, significant works in the field into her or his research. 

 "In writing the literature review, the purpose is to convey to the reader what knowledge and ideas have been established on a topic, and what their strengths and weaknesses are. The literature review must be defined by a guiding concept (eg. your research objective, the problem or issue you are discussing, or your argumentative thesis). It is not just a descriptive list of the material available, or a set of summaries.( http://www.writing.utoronto.ca/advice/specific-types-of-writing/literature-review )

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Acknowledgements

Many thanks to Kate Houston and Libbie Blanchard of CQ University Libraries, (Queensland, Australia) whose LibGuide on the Literature Review served as a framework for this guide.

Designed and updated by Michael Coffta

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How to Write a Literature Review

What is a literature review? Written in essay style, a literature review (Lit Review) describes, classifies, and evaluates the sources of information published on a given topic. A Lit Review is not just a list of books/articles.  It’s a review of a collection of research published by accredited scholars and researchers that is relevant to a research question. “Non-scholarly” sources, i.e., those you don’t want to reference, include but are not limited to magazines, newspapers, web sites, and non-published material. The Lit Review does not have to be exhaustive; the objective is not to list as many relevant books, articles, and reports as possible. The idea of the Lit Review is not to provide a summary of all the published work that relates to your research, but a survey (summary and evaluation) of the most relevant and significant work. A Lit Review is a critical look at the existing research that is significant to the work you are carrying out. It’s not just a summary. While you do need to summarize your relevant research, you must also: •    evaluate this work, •    show the relationships between different works, and •    demonstrate how it relates to your work. A Lit Review is about the existing literature on your subject and provides background for your own research findings or commentary. How much sense does your research make if you don’t provide background to the reader about past research conducted by others?

What is the value of a literature review? A Lit Review provides your reader with a survey of the professional publications available on your topic. It demonstrates that you have not only thoroughly researched your topic but also carefully examined and critically evaluated the range of relevant sources. In writing the Lit Review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic and what their strengths and weaknesses are. A Lit Review: •  places the paper within the context of known research on the subject; focuses one’s own research topic. •  provides thorough knowledge of previous studies; introduces seminal works. •  indicates timely nature of one’s research, if applicable. •  suggests previously unused or underused methodologies, designs, quantitative, and qualitative strategies. •  identifies gaps in previous studies; identifies flawed methodologies and/or theoretical approaches; avoids replication of mistakes. •  identifies possible trends or patterns in the literature. •  helps the researcher avoid repetition of earlier research. •  determines whether past studies agree or disagree; identifies controversy in the literature. •  tests assumptions; may help counter preconceived ideas and remove unconscious bias.

What is the “literature” in a literature review? The “literature” is the collection of books and journal articles, government documents, and other scholarly works you found to be relevant to your research topic. •    Journal articles: An excellent source for a Lit Review. These are good especially for up-to-date information. They are frequently used in Lit Reviews because they offer a relatively concise, up-to-date format for research, and because all reputable journals are refereed or peer-reviewed, i.e., editors publish only the most relevant and reliable research that has been reviewed by other experts in the field. •    Books:  Generally, a good source for a Lit Review. Books tend to be less up-to-date as it takes longer for a book to be published than for a journal article. Textbooks are unlikely to be useful for including in your Lit Review as they are intended for teaching, not for research, but they do offer a good starting point from which to find better, more detailed sources. •    Conference proceedings: A good source for a Lit Review. These can be useful in providing the latest research or research that has not been published. They are also helpful in providing information on which people are currently involved in which research areas, and so can be helpful in tracking down other work by the same researchers. •    Government/corporate reports: A good source for a Lit Review. Many government departments and corporations commission or carry out research. Their published findings can provide a useful source of information, depending on your field of study. •    Newspapers: Not a good source for a Lit Review. Since newspapers are generally intended for a general (not specialized) audience, the information they provide will be of no use for your Lit Review. Journalists are generally not scholars, i.e., experts on the topic on which they are writing, and thus newspaper articles are not scholarly sources. •    Theses and dissertations: Can be a good source for a Lit Review. These can be useful sources of information. However there are disadvantages: 1) they can be difficult to obtain since they are not always published but are generally only available from the library shelf or through interlibrary loan; 2) the student who carried out the research may not be an experienced researcher and therefore you might have to treat their findings with more caution than published research. Note: Some dissertations are available from the DuBois Library databases. •    Web sites: Never a good source for a Lit Review. The fastest-growing source of information is on the Internet. It is impossible to characterize the information available but here are some hints about using electronic sources: 1) bear in mind that anyone can post information on the Internet so the quality may not be reliable, and 2) the information you find may be intended for a general audience and so may not be suitable for inclusion in your Lit Review (information for a general audience is usually less detailed and less scholarly). Note: This section does not refer to scholarly articles located on the DuBois Library databases. Databases are not web sites. •    Magazines: Not a good source for a Lit Review. Magazines intended for a general audience, e.g., Time, Us, National Enquirer, will not be useful in providing the sort of information you need. Specialized magazines may be more useful (for example business magazines for management students), but usually magazines are not useful for your research except as a starting point by providing news or general information about new discoveries, policies, etc. that you can further research in more specialized sources. How is a literature review different from an annotated bibliography? A Lit Review is written in the style of an expository essay; it has an introduction, body, and conclusion, and it is organized around a controlling idea or thesis. Compare this to an annotated Works Cited list, which is simply an alphabetized list of sources accompanied by summaries and evaluations (annotations). While a single source appears just once in an annotated Works Cited list, it may be referred to numerous times in a Lit Review, depending upon its importance in the field or relationship to other sources. Finally, a Lit Review includes its own in-text citations and Works Cited list.

How is a literature review different from a traditional research paper? A Lit Review may stand alone as a self-contained unit or be part of a research paper (such as a chapter in an honors thesis). Whereas the main body of a research paper focuses on the subject of your research, the Lit Review focuses on your sources. Put another way, in the research paper you use expert sources to support the discussion of your thesis; in a Lit Review, you discuss the sources themselves.

What are the characteristics of a literature review? Among the characteristics you should expect to see in any Lit Review are these: •    A Lit Review MUST have a Works Cited list that includes all references cited in the Lit Review. Do not list sources in the Works Cited list that are not directly cited in the Lit Review. •    A Lit Review is organized by subtopic, NOT by individual source. In a typical Lit Review, you may cite several references in the same paragraph and may cite the same reference in more than one paragraph if that source addresses more than one of the subtopics in the Lit Review. •    Typically, discussion of each source is quite brief. The contribution you make is organizing the ideas from the sources into a cogent argument or narrative that includes your perspectives. •    You should focus on citing the material that originates with each reference. This may require a careful reading of the reference. If the reference author refers to another source whose ideas are relevant or interesting, you are better off tracking down and using that reference. Citing a source that you haven’t read directly is called “grandfathering,” and it is not permitted. Never cite a source you haven’t read.

How is a literature review structured? The Lit Review is not just a descriptive list of the material available or a set of summaries. Demonstrate that you gained a thorough knowledge of the subject area being studied. A Lit Review should NOT be organized as a narrative of your own research process. A Lit Review that says essentially “First I found this source, then I found this one ….” is NOT acceptable. Therefore, like any expository essay, a Lit Review should have an introduction, body, and conclusion: The introduction should contain your research question (thesis statement), an explanation of its significance, and any other background information setting the context of your research. The body paragraphs contain your summative, comparative, and evaluative comments on the sources you’ve found. These comments may pertain to: •    historical background & early research findings •    recent developments •    areas of controversy among experts •    areas of agreement •    dominant views or leading authorities •    varying approaches to or perspectives on the subject •    qualitative comparisons and evaluations The conclusion summarizes major issues in the literature; it also establishes where your own research fits in and what directions you see for future research.

How is a literature review organized? While covering the range of matters listed above, a Lit Review—like any expository essay—should still have a single organizing principle expressed in a thesis statement. Examples of some common ones are these: •    Chronological — Use this organization if developments over time are important to explain the context of your research problem. Otherwise, using a chronological system is not the best way to organize your work. •    Thematic — Depending on your topic, you could organize your Lit Review by time, geographic location, gender, nationality, or another appropriate theme. •    Methodological — What approaches have researchers taken in studying the issue you’re researching? Is your topic suited best for library research or field research? •    Qualitative — Is there a great deal of difference in the quality of research conducted on your topic?

What are some strategies for writing a good literature review? The process of writing a Lit Review typically involves a number of steps. These should include the following: •    Deciding on a relatively focused topic or question. •    Searching for relevant and relatively current literature (books, journal articles, etc. – the mix of these depends on your topic or thesis statement). It is important to locate and comment on the most important works in your chosen field. Failure to include such works might be considered a major failing of your review. The more you research and read, the more you become aware of names that are mentioned repeatedly as influential and even seminal authorities. •    Reading the materials you have found and noting how they approach your topic or question: It isn’t necessary to read every word of a book to learn what an author says about a particular subject. Peruse the index. Skim through the book or article. A quick read through the introduction or the conclusion gives a gist of the book’s or article’s thesis, general points, or argument. Begin with the most recent studies and work backwards. A recent article’s list of references or bibliography might provide you with valuable works to consult. •    Preparing a working outline for your Lit Review and grouping notes from your references in the appropriate section of your outline: Use note cards with citations and annotations, photocopied articles with points highlighted and notes in the margins, or whatever methods helps you keep your information organized. •    Take good notes: Don’t trust your memory. Record all research. Write out the complete bibliographic citation for each work. Record the page number too, because you’ll need it for your in-text citations. (Unless you are citing an entire book or journal article, the in-text citation must include a page number or it’s considered incomplete/inaccurate.) Write direct quotations word for word. Use quotation marks, so it can be recognized as a direct quote. Avoid using too many direct quotations. Take down the substance of the author’s ideas in your own words (paraphrase). IMPORTANT: Most of the review should be primarily in your own words with appropriate documentation of other’s ideas. Don’t take too many notes from a single source or two. Use a wide range of sources. •    Evaluating the information: After reading a lot of material, researchers must carefully evaluate it and decide what should be included in the literature review. Obviously researchers must be objective. Keep an open mind and look at a topic from different vantage points. Determine the objectivity of the material. Who funded the research studies? Who actually performed the research? For a contentious topic, present as equally as possible opposing positions. Be objective. Don’t overemphasize one side. •    Writing and revising the narrative: Keep your audience in mind as your write. Keep your paragraphs short and use subheadings to clarify the structure. Subheadings break the material into readable units. A Lit Review must be organized around and directly related to the thesis or research question you are developing. It must identify areas of controversy in the literature and formulate questions that need further research.

Some traps to avoid: •    Trying to read everything! As you might already have discovered, if you try to be comprehensive you will never be able to finish the reading! The Lit Review does not have to be exhaustive; the objective is not to list as many books, articles, and reports as possible. The idea of the Lit Review is not to provide a summary of all the published work that relates to your research, but a survey of the most relevant and significant work. The Lit Review should contain the most pertinent related studies and show an awareness of important past research and practices and promising current research and practices in the field. •    Reading but not writing! It’s easier to read than to write: given the choice, most of us would rather sit down with a cup of coffee and read yet another article instead of putting ourselves in front of the computer to write about what we have already read! Writing takes much more effort, doesn’t it? However, writing can help you to understand and find relationships between the works you’ve read, so don’t put writing off until you’ve “finished” reading – after all, you will probably still be doing some reading all the way through to the end of your research project. Also, don’t think of what you first write as being the final or near-final version. Writing is a way of thinking, so allow yourself to write as many drafts as you need, changing your ideas and information as you learn more about the context of your research problem. •    Not keeping bibliographic information! The moment will come when you have to write your Works Cited list . . . and then you realize you have forgotten to keep the information you need, and that you never got around to putting references into your work. The only solution is to spend a lot of time in the library tracking down all those sources that you read and going through your writing to find which information came from which source. To avoid this nightmare, always keep this information in your notes. Always put references into your writing.

Literature Reviews, Systematic Reviews & More for Health Sciences

Lit Reviews & Meta-Analysis

This video from North Carolina State University Libraries give an overview of the Literature Review process. (about 9 1/2 minutes)

This video from the University of Texas at San Antonio Libraries is directed at Psychology students, but gives some examples of how to organize & present the results of a literature review. (about 4 minutes)

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  4. Literature Reviews

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  5. Book or Literature Reviews

    Description of the book's main topic, purpose and/or point of view, answering questions such as: · Assessment of the book's main points, biases

  6. Literature Review

    A Literature Review is a systematic and comprehensive analysis of books, scholarly articles, and other sources relevant to a specific topic

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  10. What is a literature review?

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  11. How to Write a Literature Review

    What is a literature review? Written in essay style, a literature review (Lit Review) describes, classifies, and evaluates the sources of information published

  12. Books & Videos on Writing a Literature Review

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