A literature review surveys published research on your topic, organizes it into themes and shows where the open questions lie. In a STEM project it sets up the gap your own work will address.
This page walks through searching, screening, organizing and writing, with a structure table, an example synthesis paragraph and a checklist. It works for a dissertation chapter, a project report or a standalone review assignment.
What a Good STEM Literature Review Does
A good literature review groups studies by theme or method, compares their findings and methods, judges their strengths and weaknesses, and ends by stating a specific gap that your project fills.
The most common reason for low marks is summarizing papers one after another instead of synthesizing them.
Structure of a Literature Review
| Part | What it does | Typical share |
|---|---|---|
| Introduction | Defines the topic and scope, explains how you searched | 10 percent |
| Thematic sections | Each theme compares studies, methods and findings | 70 to 80 percent |
| Summary and gap | Draws themes together and states what is still unknown | 10 to 15 percent |
Themes can follow concepts (materials, mechanisms, applications), methods (experimental, computational, field studies) or a timeline when the field has moved through clear stages. Choose whichever makes the gap easiest to see.
Searching the Literature
Plan the search before you start. Write down your research question, the key concepts and the synonyms for each.
- Databases: IEEE Xplore and ACM Digital Library for engineering and computing; PubMed for biomedical work; Scopus and Web of Science across disciplines.
- Boolean operators: combine terms with AND, OR and NOT, for example ("solid-state battery" OR "solid electrolyte") AND lithium AND degradation.
- Filters: date range, document type and language, recorded so you can report them.
- Citation chasing: check the reference lists of key papers and see who has cited them since.
Keep a log of each search string, the database and the number of results. It lets you describe your method in the introduction and repeat the search later.
Screening and Selecting Papers
- Remove duplicates found across databases.
- Screen titles and abstracts against inclusion criteria, such as topic, date and study type.
- Read the full text of the shortlist and exclude papers that do not meet the criteria.
- Record how many papers you kept and why others were excluded.
For a formal systematic review, follow a recognized reporting guideline such as PRISMA and its flow diagram. Most coursework reviews do not need that, but a short description of your criteria still adds credibility.
Organize with a Synthesis Matrix
A synthesis matrix is a table with one row per paper and one column per point of comparison. It turns a pile of PDFs into something you can compare at a glance.
| Study | Method | Sample or system | Key finding | Limitation | Theme |
|---|---|---|---|---|---|
| Paper 1 | Experiment | Three electrolyte compositions | Capacity fade fell with dopant X | Room temperature only | Materials |
| Paper 2 | Simulation | DFT model | Predicts the mechanism behind Paper 1 | Not validated experimentally | Mechanisms |
| Paper 3 | Experiment | Cells cycled at 60 °C | Dopant benefit disappears at high temperature | Small sample | Materials |
Reading down a column shows patterns, such as every experiment being run at room temperature. Those patterns become your themes and, often, your gap.
Synthesize, Do Not Summarize
Synthesis means writing about ideas, with papers as evidence, rather than writing about papers one at a time. Each paragraph should make a point that draws on several studies.
Summary (weak). Lee et al. (2021) studied dopant X and found less capacity fade. Kumar (2022) used a simulation. Osei et al. (2023) tested cells at 60 °C.
Synthesis (strong). Doping with X appears to reduce capacity fade, but the evidence is limited to room temperature. Lee et al. (2021) observed the effect experimentally and Kumar (2022) proposed a mechanism through simulation, yet Osei et al. (2023) found that the benefit vanished at 60 °C. Because no study has tested intermediate temperatures, it remains unclear where the effect breaks down, which matters for cells used in warm climates.
Names, years and findings are illustrative.
The strong version opens with a claim, compares the studies, notes a contradiction and ends by pointing to a gap. That pattern works for almost every paragraph of a review.
Identifying the Gap
A research gap is a specific question the literature has not yet answered well. It should come out of your themes, not be announced without support.
- Untested conditions: temperatures, populations or scales no study has covered.
- Conflicting results: studies that disagree with no clear explanation.
- Method limits: findings based only on simulation, small samples or short trials.
- New tools or data: methods that could answer an old question better.
Avoid claiming that "no research exists" unless your search log supports it. "Few studies have tested..." is safer and usually more accurate.
Checklist Before You Submit
- The scope and search method are stated in the introduction.
- Sections are organized by theme, not by paper.
- Each paragraph opens with a claim and uses several sources as evidence.
- Strengths and limitations of studies are discussed, not just results.
- The gap follows logically from the themes.
- Sources are recent where the field is moving fast, and peer-reviewed.
- Every in-text citation matches an entry in the reference list.
How STEM Donkey Helps with Literature Reviews
Send your topic or research question, the scope (date range, number of sources, databases), the citation style, the word count and any papers you already have. Deadlines run from 3 hours to 20 days, and a full review is best with at least a week.
A writer in your field prepares a custom literature review written from scratch, organized by theme with a clear gap, using real, verifiable sources. It is plagiarism-checked and meant for study and reference.
Choose a Standard, Master or Elite writer, see the price before you pay, and get free revisions within the scope of your original request. Your identity is never shared with the writer.
Want a Literature Review That Synthesizes, Not Lists?
Send your topic, scope and citation style. You get a custom review organized by theme, with a clear gap and correctly formatted references.
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Frequently Asked Questions
It depends on the level and length. A coursework review might use 15 to 30 sources, while a dissertation chapter often uses many more. Follow your brief.
In fast-moving fields, mostly from the last five to ten years, plus foundational older work. In slower fields, older sources are more acceptable.
It should include your evaluation: which studies are stronger, where findings conflict and why that matters. It should not include unsupported personal views.
A systematic review follows a strict, pre-planned protocol to find and appraise all relevant studies, often with a reporting guideline such as PRISMA. A standard literature review is more selective.
Yes, for context and to find primary studies, but rely mainly on primary research for the specific findings you discuss.
Summarize the main themes, state the gap clearly and link it to your research question or aims.