What a Literature Review Actually Does

A literature review is not a list of books you have read, nor a summary of what other researchers found. It is a structured, critical examination of existing knowledge that establishes the intellectual foundation for your own study.

When you write a literature review for your undergraduate dissertation, you are answering three questions: What do we already know about this topic? Where are the gaps, contradictions, or unresolved debates? And how does my study contribute to this body of knowledge?

The difference between a weak literature review and a strong one is synthesis. A weak review describes each source separately. A strong review groups sources around themes, identifies agreements and tensions, and uses that analysis to justify your research.

Build a Search Strategy First

Before writing, you need to find relevant literature systematically. Many students begin searching randomly and end up with an unfocused collection of loosely related articles. A structured search prevents this.

Start by identifying your core concepts. If your research question is: What is the relationship between daily social media use and academic performance among undergraduate students? Your core concepts are: social media use, academic performance, and undergraduate students.

Search those concepts in academic databases: Google Scholar, JSTOR, PubMed (for health topics), ERIC (for education), or your institution subscribed databases. Use Boolean operators. Searching social media AND academic performance gives more targeted results than typing the full phrase as a sentence.

Set Your Search Boundaries

• Date range: Prioritize literature from the last ten years. Foundational theories may require older sources.
• Publication type: Peer-reviewed journal articles are the gold standard. Conference papers, government reports, and books may also be appropriate depending on your field.
• Geographic scope: If your research is Nigeria-specific, include both local studies and international literature to show how the local context relates to global findings.

Evaluating What You Find

Not every article deserves inclusion. Apply critical judgment. Ask: Is this peer-reviewed? Is it genuinely relevant to my research question, or just loosely related to my general area? Is the methodology sound? Are the findings applicable to my context?

A study on social media use among teenagers in the United States may be relevant background, but note the contextual difference when applying its conclusions to Nigerian undergraduates. That note of caution itself demonstrates critical thinking.

Organizing by Theme, Not by Author

After gathering 20 to 30 sources, organizing them feels overwhelming. The solution is to group by themes, not by individual authors. Identify the major subtopics within your literature and use those as your section headings.

For a social media and academic performance dissertation, themes might include:

• How social media use affects attention and concentration
• The relationship between screen time and study hours
• Social media as a platform for academic collaboration
• Differences by platform type (Instagram vs WhatsApp vs TikTok)

When you write each theme section, explain what multiple researchers found on that subtopic, note where they agreed, note where they disagreed, and identify what remains unresolved.

Writing Synthesis, Not Summary

This is the most important distinction. Here is what NOT to do:

Smith (2019) found that social media use negatively affected academic performance. Jones (2020) found the same. Brown (2021) also found that students who used social media more performed worse academically.

This is a source-by-source summary. It tells the reader nothing analytical. Here is what synthesis looks like instead:

Multiple studies have established a negative association between passive social media consumption and academic performance (Smith, 2019; Jones, 2020; Brown, 2021). However, Brown (2021) found this relationship significantly moderated by self-regulation capacity, suggesting that the platform itself may be less influential than the student ability to manage usage intentionally.

The second version groups findings, introduces nuance, and points toward complexity. That complexity is what justifies further research.

Identifying the Research Gap

Your literature review should culminate in a clear statement of the gap your study will address. This gap must be genuine, not manufactured.

Common gap types:

• Geographic gap: Most studies examined this in the US or UK; few explore it in Nigerian university contexts.
• Population gap: Existing studies focus on secondary school students; this study examines undergraduates specifically.
• Methodological gap: Most studies rely on self-reported screen time; this study uses objective usage logs.
• Theoretical gap: Existing frameworks have not accounted for socioeconomic access to devices as a moderating variable.

State the gap explicitly. For example: While substantial research exists on social media use and academic performance in North American and European contexts, studies examining Nigerian undergraduate populations remain limited. This study addresses that gap by examining the relationship within three Nigerian universities.

Connecting Literature to Your Research

Every section of your literature review should connect either to the existing body of knowledge or to the justification for your study. Literature that has no relationship to your research question should be removed, even if it is individually interesting.

A useful test: after reading each section of your draft, ask yourself: What does this tell the reader about why my study is necessary? If you cannot answer clearly, revise or remove the section.

Structure of the Literature Review Chapter

• Introduction: Brief explanation of what the chapter covers and how it is organized.
• Conceptual definitions: Define key terms as used in this study, especially where disciplines define them differently.
• Theoretical framework: If your study is grounded in a theory, introduce and explain it here.
• Thematic review: The main body, organized by themes not by individual authors.
• Research gap: What is missing or unresolved in existing literature.
• Chapter summary: A brief synthesis of key findings and how they lead to your study.

Common Mistakes

Over-quoting

Your literature review should be predominantly your own synthesis and analysis. Use direct quotes only when the original wording is particularly significant. Paraphrase and cite the vast majority of sources.

Using non-academic sources

Websites, news articles, and social media posts are generally not appropriate as primary academic citations. Use peer-reviewed journals, books from academic publishers, and government or institutional reports.

Describing rather than analyzing

The literature review is analytical. Evaluate the quality of findings. Do conclusions hold across different populations? Are there methodological limitations that qualify results? Raise these questions even when you do not have a definitive answer.

Ignoring contradictions

If two credible studies found opposite results, do not silently ignore one of them. Acknowledging contradictions and attempting to explain them demonstrates intellectual honesty and critical thinking.

Literature Review vs Literature Review for Publication

An undergraduate dissertation literature review serves primarily to justify your study and establish its academic context. A literature review written for academic publication is a different undertaking: broader scope, systematic search protocols (often with PRISMA documentation), rigorous quality appraisal, and a higher standard of critical synthesis. If you are working toward publication, see the separate guide on writing a literature review for a published manuscript.

What to Do Next

Once your literature review establishes the theoretical foundation and identifies the gap your study will address, the next step is designing your methodology. Your methodological choices should directly respond to what you found in the literature.

Continue to Step 4: How to Write a Research Methodology Chapter.

Or go back to Step 2: How to Write an Undergraduate Dissertation Proposal.

Return to the Undergraduate Dissertation Roadmap for a full overview of all eight steps.