To write a literature review, you search for the research on a topic, evaluate it and synthesise it into an argument about what is known, what is debated and what is missing. It is not a list of summaries.
This guide gives you a six-step method, a tool for synthesis, structure options, an example paragraph and the mistakes that most often hold reviews back, whether yours is a standalone assignment or a chapter of a dissertation.
The Six Steps of a Literature Review
Define your scope and question, search systematically, select and read sources critically, organise them in a synthesis matrix, choose a structure by theme, method or chronology, and write the review as an argument that leads to a clear gap.
Each paragraph should discuss several sources together, comparing and evaluating them, rather than describing one study at a time.
What a Literature Review Is For
A literature review does three jobs. It shows the reader what is already known about a topic, it evaluates the quality and agreement of that knowledge, and it identifies a gap or problem that justifies further work.
In a dissertation or research paper, that gap leads directly to your research question. In a standalone review, it leads to conclusions about the state of the field and recommendations for practice or future research.
| Type | Purpose | Typical setting |
|---|---|---|
| Narrative or traditional | Summarise and critique a field | Coursework, dissertation chapters |
| Systematic | Answer a focused question with an explicit, repeatable method | Health sciences, postgraduate research |
| Scoping | Map the size and nature of a body of research | New or broad topics |
| Integrative | Combine different kinds of studies into one picture | Nursing and education |
Step 1: Define Your Scope and Question
A review without boundaries never ends. Before searching, decide what you are reviewing and why.
- Question: what do you want the literature to tell you?
- Time frame: often the last 5 to 10 years, plus older landmark studies.
- Population or context: for example, small firms, adolescents or intensive care units.
- Types of source: peer-reviewed research, reviews, books, grey literature.
- Length: your word limit decides how many sources you can discuss well.
Too broad: social media and mental health.
Focused: what does research since 2015 show about the link between passive social media use and anxiety in university students?
Step 2: Search Systematically
Break your question into key concepts and list synonyms for each. Combine synonyms with OR and concepts with AND in your library's databases.
- Choose two or three databases suited to your discipline.
- Run your search and note the date, terms and number of results.
- Apply limits such as date range, language and peer review.
- Screen titles and abstracts against your scope.
- Read promising full texts and check their reference lists for more.
Stop when new searches keep returning studies you already have. That saturation point is a good sign your search is complete enough.
Step 3: Read Critically
Critical reading means asking how strong and relevant each source is, not just what it says. Note the answers as you read, because they become the evaluation in your review.
| Question | Why it matters |
|---|---|
| What is the study's aim and design? | Design decides what kind of claims it can support |
| Who or what was studied, and how many? | Small or unusual samples limit generalisation |
| What are the key findings? | The core content you will synthesise |
| What are the limitations? | Shows how much weight the study deserves |
| How does it relate to other studies? | Agreement and conflict drive your synthesis |
Step 4: Organise with a Synthesis Matrix
A synthesis matrix is a table with sources as rows and themes as columns. Filling it in shows you, at a glance, where studies agree, conflict or fall silent.
Example matrix (shortened).
| Source | Passive use and anxiety | Social comparison | Method |
|---|---|---|---|
| Study A (2018) | Positive link | Main mechanism | Survey, large sample |
| Study B (2020) | Weak link | Not measured | Longitudinal |
| Study C (2022) | Positive link | Partial mechanism | Experience sampling |
The columns become your themes, and the empty cells show where the gaps are.
Step 5: Choose a Structure
Like any academic text, a literature review has an introduction, a body and a conclusion. The body can be organised in several ways.
| Structure | How it works | Best when |
|---|---|---|
| Thematic | One section per theme or debate | Most reviews; shows synthesis clearly |
| Methodological | Grouped by research approach | Methods produce different findings |
| Chronological | Traces how thinking developed | A field has changed markedly over time |
| Theoretical | Compares competing theories | The debate is about models or frameworks |
The introduction states the topic, scope and how the review is organised. The conclusion sums up the main findings, the key gap and what it means for your research or for practice.
Step 6: Write It as an Argument
The difference between a weak and a strong review is synthesis. A weak review describes one study per paragraph. A strong review discusses a theme, bringing several studies into the same paragraph and evaluating them together.
Summary style (weak): Study A found a link between passive use and anxiety. Study B found a weaker link. Study C also found a link.
Synthesis style (strong): Most studies report a positive association between passive social media use and anxiety, although its strength varies with design (Study A, 2018; Study C, 2022). Cross-sectional surveys tend to find stronger links than the one longitudinal study (Study B, 2020), which suggests that part of the association may reflect anxious students using social media more, rather than the reverse. Few studies have tested direction directly, leaving cause and effect unresolved.
Notice how the strong version makes a claim, groups the evidence, explains a difference and ends with a gap. Each paragraph of your review can follow that pattern.
Useful Phrases for Synthesis
- Several studies agree that ...
- In contrast, ... found ...
- This difference may reflect ...
- Evidence on ... remains limited.
Common Literature Review Mistakes
| Mistake | Fix |
|---|---|
| One paragraph per study | Organise by theme and discuss several sources together |
| Description with no evaluation | Comment on design, sample and limitations |
| No clear gap | End each theme, and the review, with what is unknown |
| Too many old sources | Focus on recent work; keep classics where essential |
| Over-quoting | Paraphrase and synthesise in your own words |
| Ignoring studies that disagree | Address conflicting evidence and explain it |
Final Revision Checklist
- The introduction states the topic, scope and structure of the review.
- Each section is built around a theme, not a single source.
- Most paragraphs cite more than one study.
- Every key study is evaluated, not just described.
- Conflicting findings are discussed and, where possible, explained.
- The conclusion names the main gap and links it to your question or to practice.
- Every in-text citation matches an entry in the reference list.
Read only the first sentence of each paragraph in order. If those sentences tell the story of the field and lead to your gap, the review is working. If they read like a list of authors, revise the topic sentences so each one makes a claim.
Finally, check balance. A review that spends three pages on one theme and a paragraph on another may need trimming or expanding, so the space each theme gets reflects its importance to your question.
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Frequently Asked Questions
It depends on the purpose. A coursework review may be 1,500 to 3,000 words; a dissertation chapter often makes up 20 to 30 percent of the whole dissertation.
It varies by level and length. Undergraduate reviews often use 15 to 30 sources; postgraduate reviews use more. Follow your brief.
An annotated bibliography summarises and evaluates sources one by one. A literature review synthesises them into an argument organised by theme.
It should have a clear argument or purpose, often a statement about what the literature shows and where the gap lies.
Some disciplines allow it, especially to describe your search. Many prefer a neutral academic voice. Check your guidelines.
Look for questions studies have not answered, populations they have not included, conflicting results and methods that have not been tried.
Many briefs ask for sources from the last 5 to 10 years. Older studies are fine when they are foundational to the field.
Use the past tense for what individual studies found and the present tense for general conclusions about the field.
Yes. Send your research question, proposal and any sources, and a writer at the right level prepares a custom chapter.