A literature review examines what researchers already know about a topic. Rather than presenting new results, it compares existing studies, assesses the evidence behind them, and identifies where the research agrees, conflicts, or leaves questions unresolved.
A series of summaries is not the same as a literature review. If each paragraph begins with a different author's name, the discussion is probably organized around individual papers instead of the ideas that connect them. The ideas should determine the structure, while individual studies provide the supporting evidence.
Key Takeaways
- A literature review summarizes existing research, synthesizes its findings, and evaluates the evidence.
- Connect sources by theme or finding, and explain where researchers agree or disagree.
- Most reviews have an introduction, a body, and a conclusion.
- The appropriate type of review depends on the research goal.
- Verify every claim and citation against the original source.
What Is a Literature Review?
A literature review critically examines published research on a topic or research question. It explains what the research has established, where findings conflict, and which questions remain unanswered.
According to the University of Toronto Writing Advice Centre, the discussion should be guided by a research objective, problem, or thesis. Simply describing every source you found does not produce a literature review.
That distinction separates a literature review from an annotated bibliography. An annotated bibliography treats sources individually. A literature review examines the relationships among them.
What Does a Strong Literature Review Do?
A strong literature review has four main functions:
Summary establishes what each source says. Synthesis explains how the sources relate to one another. The San José State University Writing Center describes this process as identifying connections and relationships among sources.
Literature Review Example: Building an Argument from Three Sources
Consider this research question:
How is social media use related to loneliness and depression among young people?
Three studies offer different answers:
- Primack et al. (2017) associated frequent social media use with greater perceived isolation, but the study could not establish causation.
- Hunt et al. (2018) found that undergraduates who limited social media use reported less loneliness and depression. However, the experiment lasted only three weeks.
- Coyne et al. (2020) found no long-term relationship between increased social media time and mental health problems.
A source-by-source summary might say:
Primack et al. connected social media use with isolation. Hunt et al. found that limiting social media reduced loneliness and depression. Coyne et al. found no long-term relationship.
The paragraph accurately reports the findings, but it leaves the reader to work out how the studies relate to one another.
A literature review should make that relationship explicit:
The available research does not support a simple conclusion that more time on social media always harms mental health. Primack and Hunt found links between social media use and loneliness or depression, while Coyne found no comparable long-term relationship. This disagreement suggests that the way social media is used may matter more than total screen time alone.
The revised paragraph compares the findings and accounts for their differences. It also develops a conclusion that no single source provides on its own.
With a larger collection of papers, Verla's Literature Review Generator can help group uploaded sources by theme and identify agreements, contradictions, or gaps. Check each suggested connection against the original studies before including it in the review.
Common Types of Literature Reviews
A meta-analysis is usually part of a systematic review. Undergraduate assignments are more likely to require a narrative or critical review unless the instructions specify a systematic method. The NCBI guide to literature review methods provides a more detailed account of these approaches.
How to Structure a Literature Review
Most literature reviews consist of an introduction, a body, and a conclusion.
The introduction defines the topic, scope, and organizing approach. The body compares and evaluates research by theme, method, or theory. The conclusion brings the findings together and identifies important gaps in the evidence.
The body may follow a thematic, chronological, methodological, or theoretical structure. A thematic review of social media and mental health, for example, might contain sections on "Passive use and social comparison," "Active participation and social support," and "Problems with screen-time measures."
How to Write a Literature Review in 6 Steps
Define the research question
Narrow the topic by population, outcome, or setting. "Social media and mental health" is too broad to guide a focused review. A more specific question would be:
How does passive social media use affect loneliness among university students?
When the review is based on a course prompt, upload the rubric, instructions, and required readings to Verla Assignment before developing the plan.
Find academic sources
Search databases relevant to the subject, such as JSTOR, PubMed, PsycINFO, Scopus, or your university library. Use several keyword combinations and record the searches you conduct.
Evaluate the evidence
For each study, note the population, method, findings, and limitations. Check whether the design supports a causal conclusion or shows only an association.
Compare the sources
A synthesis matrix can make relationships among studies easier to see. Create columns for the method, main finding, limitation, and theme. Verla AI Essay Advisor can assist with summarizing uploaded papers and locating recurring arguments, but those summaries should be checked against the papers themselves.
Organize the outline around ideas
Use headings based on findings or debates rather than researcher names. Group papers according to whether they support, challenge, or qualify the same point.
Write and revise
Move clearly between evidence and interpretation. Transitions such as "similarly," "however," and "taken together" can show how one finding relates to the next. Verify every citation against the original source before submitting the review.
Once the analysis is settled, Verla AI Refiner can be used to revise clarity, flow, and academic tone while preserving the central argument.
Common Literature Review Mistakes
Common problems include:
- Summarizing one source in each paragraph without connecting the findings
- Choosing a topic too broad for a focused review
- Reporting results without examining the methods
- Overlooking evidence that contradicts the main argument
- Citing a source without checking the original text
Use Verla's Literature Review Generator to organize your sources into a structured review.