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How do you write a literature review at bachelor's, master's and PhD level?

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To write a literature review, search the research on your topic, evaluate what you find, and synthesise it into an argument about what is known and missing.

To write a literature review, search the research on your topic, evaluate what you find, and synthesise it into an argument about what is known and missing. That task is the same at every level; what changes between a bachelor's dissertation, a master's thesis and a PhD is how widely you must read, how independently you must judge, and how much of the argument has to be your own.

This guide covers the constant part first, then how expectations scale; the doctoral guidance and worked examples for Vietnamese researchers remain below, in the PhD section.

Author: MAAS Research Methods Publishing Desk · Reviewed by a Principal Academic Mentor (PhD, doctoral supervisor and thesis examiner)
Last updated: 2026-07-02
Category: thesis-dissertation

What a literature review is, and what it is not

The University of Queensland Library (n.d.) defines a literature review as "a survey and critical analysis of what has been written on a particular topic, theory, question or method". Survey means covering the relevant research; critical analysis means weighing what you find, not just reporting it. The University of Southampton Library (2026) adds that the review is both a process, the searching and evaluating that runs alongside the whole project, and a product, the written text presenting your argument about the field.

A literature review is also not a theoretical framework: the review surveys and evaluates the field, while the framework selects the theories your study will think with. The guide to writing a theoretical framework maps that boundary.

Literature review vs annotated bibliography

An annotated bibliography evaluates each source separately, entry by entry, while a literature review collates, links and evaluates sources around themes, so studies appear in conversation instead of standing in a queue (Sheffield Hallam University Library, n.d.). If your draft could be reordered alphabetically without losing anything, it is still a bibliography.

What the review does for your project

All research needs to be situated in the work that came before it, and Monash University Library (n.d.) names three jobs the review performs: locating the gaps in existing research and justifying why your study is needed, locating the theorists and theories your work can draw on, and identifying the methodologies your field has used. Seen from the reader's side, the review establishes what is already known, which approaches have been applied, and where their strengths and weaknesses lie (Eriksson & Kovalainen, 2008, as cited in University of Queensland Library, n.d.). For a book-length treatment of the process, Ridley (2025) remains the standard student guide.

How expectations scale from bachelor's to master's to PhD

It is tempting to assume the difference between levels is just length. A more useful picture is that the task holds still while expectations rise: as you progress through higher education, the expectations on your ability to synthesise increase (University of Westminster Library, 2026).

What stays the same at every level

Two demands are constant. The review must critically examine the literature rather than simply list it (UNSW Sydney, n.d.), and it must situate your own project in the field (Monash University Library, n.d.). At any level, a marker asks: did this writer judge what they read, and why does this project belong here?

What rises: coverage, judgment and contribution

The comparison below describes tendencies across UK and Australian programmes; your programme handbook always has the final word.

Level Scope of reading Voice and judgment What the review must justify
Bachelor's Selective: key studies around one bounded question Guided by module reading and supervisor steer The question is worth asking and joins a conversation
Master's Wider, chosen against explicit criteria Independent: you weigh methods and evidence in your own voice A specific gap exists and your design responds to it
PhD Approaching comprehensive, including adjacent literatures Authoritative: a sustained argument ordering the field The thesis makes an original contribution to knowledge

The practical implication sits in the last column: a review that feels weak usually needs a clearer case to argue, not more sources.

How do you structure a literature review?

A literature review needs a beginning, a middle and an end, like any argument (University of Kent, 2025). The introduction gives an overview of the context and says what the review will cover; the conclusion restates the review's aim and points forward to the study to come (RMIT University Learning Lab, n.d.-a). The middle is where the organising decision lives.

Thematic, chronological and theoretical patterns

RMIT University Learning Lab (n.d.-a) names three recognised ways to organise the middle: thematically, around key topics and debates; chronologically, following how the field developed; and theoretically, grouped by the frameworks researchers apply. UNSW Sydney (n.d.) adds the inverted pyramid, narrowing from the broad field to your question, and a classic-studies pattern for fields anchored by landmark works. Thematic organisation is the usual recommendation because it forces sources into contact; whichever you choose, the structure should be yours, not borrowed from the first source you read.

How long should it be, and how many sources?

There is no fixed answer: both scale with the word limit, the level of the degree and the conventions of the discipline. A review embedded in a taught assignment is selective by design; a standalone or doctoral review moves toward comprehensive coverage. Rather than chasing a number, set inclusion criteria and confirm expectations with your supervisor or module guide.

How do you find, screen and evaluate sources?

Deciding what deserves your reading time is where reviews are won. The Open University Library Services (n.d.) offers the PROMPT framework for this screening step: weigh each source on how it is presented, how relevant it is, how objective its account is, whether its method supports its claims, where it comes from, and how timely it remains. Alongside that, set your own inclusion and exclusion criteria early and in writing, so your selectivity is defensible rather than accidental. If AI tools sit anywhere in your workflow, the guide to using AI ethically in a literature review sets out where legitimate use ends; the APA 7th referencing guide covers keeping citations accurate from the first source.

How do you synthesise sources instead of walking through them one by one?

The University of Westminster Library (2026) defines the chapter's core skill precisely: "With synthesis you extract content from different sources to create an original text. While paraphrase and summary maintain the structure of the given source(s), with synthesis you create a new structure." The working method is to summarise and synthesise in your own words what is important or controversial about each source (University of Kent, 2025).

The difference shows at paragraph level. A walked-through paragraph reads: one study found this, a second found that, a third found something else; each sentence keeps the shape of one source, and the sources never touch. A synthesised paragraph reads: most studies agree on the headline effect, and the disagreements track differences in method. That paragraph has a structure existing in no single source, and the new structure is your contribution. It is also where your voice enters: a successful review includes the voice of the writer, not only the authors reviewed (RMIT University Learning Lab, n.d.-b).

How do you identify and frame the research gap?

The gap is the review's destination: the first job Monash University Library (n.d.) assigns the review is to locate the gaps in existing research and justify the study that follows. Strong gaps come in recognisable shapes: an unexamined population or context, a methodological limitation running through the studies, an unresolved contradiction, or an assumption every study makes but none has tested. A bare absence is weaker; "no one has studied this in my country" only becomes an argument once you show why existing findings should not transfer there.

Frame the gap with restraint, because "never claim more than the evidence will support" (University of Kent, 2025). Once stated, the gap has to convert into something researchable; the guide to research questions and objectives covers that conversion.

For PhD candidates and Vietnamese researchers: what changes at doctoral level

At doctoral level the review's jobs do not change, but the stakes rise: the gap must justify an original contribution to knowledge, and the review becomes a chapter-length argument. That argument starts inside the proposal; the PhD research proposal guide shows how the proposal's short review grows into the thesis chapter.

Two patterns recur in MAAS mentoring work with Vietnamese doctoral candidates. The first is the reading log: a draft in which every paragraph begins with a new author's name and reports what that author found. One supervisor returned such a chapter calling it a reading log, not a review; regrouping the same sources around themes turned the draft around without a single new source. The second is the thin gap. A draft claiming only that little research existed on the topic in Vietnam was reframed: the existing models assumed the reliable infrastructure of high-income economies, which rural Vietnamese provinces do not have. Challenging an assumption, rather than pointing at an empty space, justified a genuinely new study design.

Writing the review in your own academic voice as an ESL writer

Writing in a second language raises an honest worry: if the sources say it better than you can, why not let them speak? The answer is that the chapter is assessed on your judgment, and judgment is only visible in your own sentences; a successful review includes the writer's own voice alongside the sources' (RMIT University Learning Lab, n.d.-b). That voice is built deliberately: paraphrase ideas into your own argument structure rather than stitching quotations together, choose reporting verbs that carry your stance, and keep a personal bank of evaluative sentence patterns from papers in your field, adapting their frames without copying their content.

Common mistakes that weaken a literature review

  1. Writing author-by-author islands. Compare and contrast the ideas of authors rather than writing one paragraph about one study, then another about the next (RMIT University Learning Lab, n.d.-a); structure by theme instead.
  2. Including everything you read. Sources that shaped your thinking but do not serve the argument belong in your notes.
  3. Overclaiming the gap. An inflated gap invites the examiner to deflate it (University of Kent, 2025).
  4. Quoting too much and too long. Heavy quoting hands the chapter's structure back to the sources (University of Kent, 2025).
  5. Leaving your own voice out. A review with no evaluative voice reads as a report (RMIT University Learning Lab, n.d.-b).

Frequently asked questions

What is a literature review?
A survey and critical analysis of what has been written on a particular topic, theory, question or method (University of Queensland Library, n.d.). It is both a research process and the written product presenting your argument about the field (University of Southampton Library, 2026).

How is a literature review different from an annotated bibliography?
An annotated bibliography evaluates each source separately, entry by entry. A literature review collates, links and evaluates sources around themes, so studies appear in conversation (Sheffield Hallam University Library, n.d.).

What is the difference between summarising and synthesising sources?
Summary keeps the structure of the source; synthesis extracts content from several sources to create an original text with a new structure (University of Westminster Library, 2026). You sum up in your own words what is important or controversial about each source, then connect those judgments (University of Kent, 2025).

Should a literature review be organised by theme, by date, or by theory?
The recognised patterns are thematic, chronological and theoretical (RMIT University Learning Lab, n.d.-a); UNSW adds inverted-pyramid and classic-studies patterns (UNSW Sydney, n.d.). Whichever you choose, compare and contrast ideas across sources rather than writing one paragraph per study (RMIT University Learning Lab, n.d.-a).

How many sources does a literature review need?
There is no fixed number: the count scales with the word limit, the level and the discipline. Shorter embedded reviews are selective, standalone and doctoral reviews aim for fuller coverage, and your supervisor or module guide sets the real expectation.

How is a PhD literature review different from a master's one?
The purpose is shared: situating the work, locating gaps and justifying the study (Monash University Library, n.d.). At doctoral level, coverage moves from selective toward comprehensive, and the review must sustain an original argument that justifies a contribution to knowledge.

Do I include my own opinion in a literature review?
Yes, as evaluative judgment rather than personal feeling. A successful review includes the voice of the person writing it, not just the authors reviewed (RMIT University Learning Lab, n.d.-b), expressed by weighing evidence in measured academic language.

WHEN YOU WANT AN EXPERIENCED READER ON YOUR REVIEW CHAPTER

A review improves fastest when an experienced reader asks what an examiner would ask: where is the argument, which sources are doing work, does the gap follow. MAAS academic mentoring pairs you with a postgraduate-qualified mentor who gives structured feedback on each draft; the reading, the judgments and the writing remain your own.

Explore academic mentoring at MAAS

References

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