A literature review is one of the most intellectually demanding pieces of academic writing you will encounter at university. Unlike an annotated bibliography (which summarises sources one by one), a literature review synthesises the existing scholarship on a topic, identifies patterns, gaps, and debates, and situates your own research question within that broader conversation. This guide takes you through every stage.
What Is a Literature Review?
A literature review is a critical evaluation of published work on a specific topic or research question. It demonstrates that you:
- Understand the existing state of knowledge in the field.
- Can identify key theories, debates, and empirical findings.
- Are aware of gaps, contradictions, or limitations in the existing research.
- Can position your own research question in relation to what is already known.
A literature review can stand alone as an assignment, or more commonly it forms a chapter (usually Chapter 2) of a dissertation or research project.
Step 1: Define the Scope of Your Review
Before you start reading, define the boundaries of your literature review. Ask yourself:
- What specific topic or research question am I reviewing?
- What time period am I covering? (e.g., only literature from the last 10 years?)
- What types of sources am I including? (Peer-reviewed articles only? Books? Grey literature?)
- What disciplines or geographic contexts am I including or excluding?
Defining your scope prevents you from trying to read everything ever written on a broad topic — an impossible task that leads to poorly focused reviews.
Step 2: Search the Literature Systematically
Use your university's library databases to search for relevant sources. Useful databases include JSTOR, ProQuest, EBSCOhost, PubMed (for health sciences), PsycINFO (for psychology), and Google Scholar. Use a combination of keyword searches, Boolean operators (AND, OR, NOT), and citation tracking (finding sources that cite key papers you have already identified).
Keep a record of your search terms and the number of results returned — some dissertations require a PRISMA flow diagram or similar documentation of the search process.
Step 3: Read Critically and Take Notes
As you read, do not try to absorb everything passively. For each source, note:
- The central argument or findings.
- The theoretical framework or methodology used.
- The key strengths and limitations of the study.
- How this source relates to other sources you have read.
- Whether the findings are widely accepted, contested, or outdated.
Using a reference matrix or spreadsheet — with sources as rows and themes as columns — makes it much easier to identify patterns across a large body of literature.
Step 4: Identify Themes, Patterns, and Gaps
A good literature review is organised thematically, not source by source. Look across all your notes and ask:
- What are the main themes or sub-topics in this body of literature?
- Where do scholars agree? Where do they disagree?
- Has the field shifted over time? What prompted those shifts?
- What questions remain unanswered? What has been under-researched?
These themes will become the sections of your literature review. Gaps in the existing research become the justification for your own study.
Step 5: Plan Your Structure
Most literature reviews are structured thematically, though a chronological or methodological structure may be appropriate in some cases:
- Thematic: Sections organised by the main themes or debates in the field. Most common and usually most effective.
- Chronological: Sections trace how the field has evolved over time. Useful when the historical development of a concept is itself important.
- Methodological: Sections organised by research method (e.g., quantitative studies, qualitative studies, systematic reviews). Useful in scientific or health disciplines.
Whatever structure you choose, your introduction should explain the scope and purpose of the review, and your conclusion should summarise the state of the field and highlight the gap your research addresses.
Step 6: Write Synthetically, Not Descriptively
The most common mistake in literature reviews is writing in a descriptive rather than synthetic way — essentially producing summaries of individual papers in sequence. A strong literature review groups ideas together and shows how sources relate to each other:
Weak (descriptive):
Smith (2019) found that student engagement improved when feedback was given within 24 hours. Jones (2020) also investigated feedback timing and found that rapid feedback improved satisfaction. Brown (2021) found that students preferred timely feedback.
Strong (synthetic):
There is consistent evidence that the timeliness of formative feedback has a significant positive effect on both student engagement and satisfaction (Smith, 2019; Jones, 2020; Brown, 2021). However, these studies focus primarily on undergraduate settings, and it remains unclear whether these findings extend to postgraduate contexts (Brown, 2021).
Step 7: Maintain a Critical Voice
Critical analysis does not mean being negative about every study. It means evaluating the evidence fairly: acknowledging the strengths of well-designed studies, noting the limitations of smaller or older studies, flagging when findings conflict with each other, and assessing the quality and generalisability of the evidence overall.
Useful critical phrases include: "However, this study was limited by...", "Notably, this finding has not been replicated in...", "More recent research suggests that...", "A significant gap in the literature concerns..."
Step 8: Write the Final Review
Your completed literature review should flow as a coherent, well-argued piece of prose. Each section should have a clear topic sentence, evidence synthesised from multiple sources, critical commentary, and a sentence that links to the next section or theme. Use clear signposting language: "A second strand of the literature concerns...", "In contrast to the quantitative evidence, qualitative studies have found...", "Despite this considerable body of evidence, several important gaps remain..."
Common Mistakes to Avoid
- Reviewing sources one by one rather than synthesising them.
- Including everything you have read, regardless of relevance.
- Failing to critically evaluate — treating all sources as equally valid.
- Over-relying on very old sources when more recent studies exist.
- Writing a literature review that is entirely disconnected from your own research question.
A well-executed literature review is the foundation of strong academic research. It demonstrates intellectual engagement with the scholarly conversation in your field and provides a clear rationale for your own study. Take the time to do it well — your dissertation marker will notice.