Research Methods
How to Write a Literature Review: Step-by-Step Guide
The literature review is often the most challenging part of a research paper. Learn how to find, organize, and synthesize sources effectively.
Anna Mikhaylyants - Harvard Senior, Psychology & Economics - 10 min read
What Is a Literature Review?
A literature review is not just a summary of sources - it's a critical analysis of existing research on your topic. It shows readers:
- What is already known about your topic
- What debates exist in the field
- What gaps your research will fill
Step 1: Define Your Scope
Before diving into sources, clarify: - What specific aspect of the topic are you researching? - What time period will you cover? - What types of sources will you include?
Step 2: Search for Sources
### Academic Databases - Google Scholar: Start here for breadth - JSTOR: For humanities and social sciences - PubMed: For health and life sciences - IEEE: For engineering and technology
### Search Strategies - Use specific keywords related to your topic - Try different combinations of terms - Look at the references in papers you find (backward searching) - Check who has cited important papers (forward searching)
Step 3: Evaluate Your Sources
Not all sources are created equal. Evaluate each for:
### Credibility - Is it peer-reviewed? - Who is the author and their credentials? - What institution published it?
### Relevance - Does it directly address your research question? - Is it recent enough to be current?
### Quality - Is the methodology sound? - Are conclusions supported by evidence?
Step 4: Organize Your Sources
Create a system to track your sources:
### Annotated Bibliography For each source, note: - Full citation - Key findings - Methodology used - How it relates to your research - Potential quotes to use
### Thematic Organization Group sources by theme, not chronologically: - Theme 1: [Related sources] - Theme 2: [Related sources] - Theme 3: [Related sources]
Step 5: Write Thematically, Not Source by Source
Wrong approach: "Smith (2020) found X. Johnson (2021) found Y. Williams (2022) found Z."
Right approach: "Research on X has shown consistent findings (Smith, 2020; Johnson, 2021), though some scholars argue Y (Williams, 2022)."
Step 6: Synthesize and Critique
Don't just summarize - analyze: - Where do researchers agree? - Where do they disagree? - What methodological approaches dominate? - What questions remain unanswered?
Step 7: Identify the Gap
Your literature review should build to a clear conclusion: here's what we know, and here's what my research will explore.
Common Mistakes
1. Summarizing instead of synthesizing: Connect sources to each other 2. Ignoring contradictory evidence: Address conflicting findings 3. Relying on secondary sources: Always read the original when possible 4. Outdated sources: Include recent research 5. Too broad: Stay focused on your specific topic
Template Structure
1. Introduction: What topic will you review and why? 2. Thematic Section 1: First major theme 3. Thematic Section 2: Second major theme 4. Thematic Section 3: Third major theme 5. Gap Identification: What's missing from current research? 6. Conclusion: How does your research address the gap?
How Many Sources Do You Need?
For a high school research paper: - Minimum: 10-15 sources - Recommended: 15-25 sources - Focus on quality over quantity
Conclusion
A strong literature review demonstrates your understanding of the field and positions your research within the larger academic conversation.
Need guidance? Our Research Scholars Program includes dedicated literature review workshops with Harvard student mentors.
Literature review is Week 2 of our Research Publication Fellowship, done alongside a Harvard student mentor.