How to Write a Literature Review (High School Guide)

A literature review is one of the most important, and most misunderstood, parts of any research paper.

It's not just a summary of sources. It's a synthesis that shows you understand your field, identifies gaps in current knowledge, and justifies why your research matters.

This guide walks you through writing a literature review step-by-step, from finding sources to organizing your final draft.

What Is a Literature Review?

A literature review surveys existing research on your topic. It serves multiple purposes:

What a Literature Review Does

Literature Review vs. Annotated Bibliography

These are NOT the same:

Key insight: A literature review tells a story about what's known, what's debated, and what's missing.

Step 1: Define Your Scope

Before searching, clarify what you're looking for.

Questions to Answer

1. What's your research question?

   • Your review should directly relate to your question
   • Everything you include should connect to your topic

2. What's your scope?

   • Time range (last 5 years? 10 years? All time?)
   • Geographic focus (global? US only? Your region?)
   • Population (all ages? Students? Specific groups?)

3. What disciplines are relevant?

   • Your topic might span multiple fields
   • A health topic might include medicine, psychology, public policy

Scope Examples

Too Broad: "Everything about climate change"

Appropriate: "Research on urban heat islands and public health outcomes in the past decade"

Too Narrow: "Studies on heat islands in Phoenix published in 2023"

Step 2: Search for Sources

Where to Find Academic Sources

Google Scholar (scholar.google.com)

• Best starting point
• Covers most disciplines
• Shows citation counts
• "Cited by" feature finds related work

PubMed (pubmed.ncbi.nlm.nih.gov)

• Best for health/medical/biology
• High-quality peer-reviewed sources
• Free abstracts, some full texts

IEEE Xplore (ieeexplore.ieee.org)

• Best for engineering and computer science
• Conference papers and journals

JSTOR (jstor.org)

• Best for humanities and social sciences
• Historical articles and primary sources

arXiv (arxiv.org)

• Best for physics, math, computer science
• Preprints (arXiv moderates submissions but does not peer review them)
• Most current findings

Search Strategies

Use Boolean Operators:

• AND: "climate change" AND "public health"
• OR: "teenager" OR "adolescent" OR "youth"
• NOT: "social media" NOT "advertising"

Use Quotation Marks:

• "machine learning" finds the exact phrase
• machine learning finds pages with both words anywhere

Try Synonyms:

• Don't just search one term
• "Anxiety" vs "stress" vs "mental health"
• "High school" vs "secondary school" vs "adolescent"

Use Filters:

• Date range
• Publication type
• Peer-reviewed only

How Many Sources?

For high school research, aim for 15-25 quality sources.

Step 3: Evaluate Your Sources

Not all sources are equal. Evaluate quality before including.

The CRAAP Test

The CRAAP Test comes from Meriam Library at California State University, Chico.

Source Hierarchy

Strongest Sources:

• Peer-reviewed journal articles
• Systematic reviews and meta-analyses
• Government reports and official statistics

Good Sources:

• Books from academic publishers
• Conference papers
• Dissertations and theses
• Reports from reputable organizations

Use Cautiously:

• News articles (for context, not evidence)
• Wikipedia (for background, never cite directly)
• Websites (check authority carefully)

Avoid:

• Blog posts without credentials
• Self-published work
• Sources without citations
• Obviously biased sources

Red Flags

• No author listed
• No date
• No citations or references
• Published on unknown website
• Makes extreme claims without evidence
• Tries to sell something

Step 4: Read and Take Notes

Efficient Reading Strategy

You don't need to read every paper cover-to-cover.

First Pass (5 minutes):

1. Read title and abstract
2. Look at figures and tables
3. Read conclusion
4. Decide: relevant or skip?

Second Pass (20-30 minutes):

1. Read introduction for context
2. Skim methods for approach
3. Study results carefully
4. Note limitations mentioned

Third Pass (as needed):

1. Deep dive into methodology
2. Understand statistical approaches
3. Take detailed notes

Note-Taking System

For each source, record:

Citation: [Full citation in your format]

Main Argument:
[1-2 sentences: What is this paper's main claim?]

Key Findings:
- [Finding 1]
- [Finding 2]
- [Finding 3]

Methods Used:
[Brief description of methodology]

Relevant Quotes:
"[Direct quote]" (p. X)

How It Connects to My Research:
[Why this matters for your paper]

Themes/Categories:
[Tags for organizing: e.g., "causes," "treatments," "methodology"]

Organizing Notes

Use one of these systems:

• Spreadsheet: Columns for each element
• Note cards: Physical or digital (Notion, Evernote)
• Citation manager: Zotero, Mendeley (can attach notes)

Step 5: Identify Themes and Patterns

This is where the "review" part happens, you're not just listing sources, you're analyzing them.

Finding Themes

As you read, look for:

• Common findings: What do multiple studies agree on?
• Contradictions: Where do studies disagree?
• Trends over time: How has understanding evolved?
• Methodological patterns: What approaches are common?
• Gaps: What hasn't been studied?

Creating a Concept Map

Organize sources by theme, not by source. (Author names in this map and in the sample paragraphs in Step 7 are placeholders, not published studies.)

THEME: Causes of Teen Anxiety
├── Social media use (Smith 2023, Jones 2022, Lee 2024)
├── Academic pressure (Brown 2023, Davis 2022)
├── Sleep deprivation (Wilson 2024, Garcia 2023)
└── Family factors (Taylor 2022, Anderson 2023)

THEME: Interventions
├── Cognitive behavioral therapy (Multiple studies)
├── Mindfulness programs (Mixed results)
└── School-based programs (Emerging research)

THEME: Gaps in Research
├── Long-term outcomes (Few longitudinal studies)
├── Diverse populations (Most studies on suburban students)
└── Prevention vs. treatment (More treatment research)

Synthesis Matrix

Create a table to compare sources across themes:

Step 6: Organize Your Review

Common Organizational Structures

Thematic (Most Common)

• Organize by topic or theme
• Best for most high school research
• Shows connections between sources

Chronological

• Organize by time period
• Good for showing evolution of understanding
• Works for historical topics

Methodological

• Organize by research approach
• Good when comparing methods is important
• Works for methodology-focused papers

Theoretical

• Organize by competing theories
• Good when there are clear schools of thought
• More advanced approach

Thematic Structure Example

Literature Review Outline:

I. Introduction to Literature Review
   - Scope and purpose
   - Overview of themes

II. Theme 1: [e.g., Causes of the Problem]
   A. Sub-theme 1a
   B. Sub-theme 1b
   C. Summary of this theme

III. Theme 2: [e.g., Current Approaches]
   A. Sub-theme 2a
   B. Sub-theme 2b
   C. Summary of this theme

IV. Theme 3: [e.g., Effectiveness of Interventions]
   A. Sub-theme 3a
   B. Sub-theme 3b
   C. Summary of this theme

V. Gaps in Current Research
   - What's missing?
   - What questions remain?

VI. Transition to Your Research
   - How your study addresses the gaps

To see where the review sits in the whole paper, use our research paper outline.

Step 7: Write Your Literature Review

Writing the Introduction

Start by orienting the reader:

Example:

"Diabetic retinopathy is one of the leading causes of vision impairment and blindness worldwide (Author, Year). Early detection significantly improves outcomes, leading to substantial research on screening methods. This review examines current approaches to diabetic retinopathy detection, focusing on three key areas: traditional clinical screening, emerging AI-based methods, and barriers to widespread implementation."

Elements:

• Broad context (why this matters)
• Scope of your review
• Preview of themes/organization

Writing Body Paragraphs

Each paragraph should:

1. Start with a topic sentence (theme, not source)
2. Synthesize multiple sources
3. Show relationships between studies
4. Include your analysis

Bad Paragraph (Source-by-Source):

"Smith (2023) studied social media and anxiety. He found a correlation of 0.45. Jones (2022) also studied this topic. She used a different method and found similar results. Lee (2024) conducted a meta-analysis."

Good Paragraph (Synthesized):

"Multiple studies have established a consistent link between social media use and adolescent anxiety. Survey-based research consistently finds moderate correlations (r = 0.40-0.50) between daily usage and self-reported anxiety symptoms (Smith, 2023; Jones, 2022). A recent meta-analysis of 23 studies confirmed this relationship, finding an overall effect size of d = 0.38 (Lee, 2024). However, the causal direction remains debated, with some researchers suggesting that anxious teens may seek social media as a coping mechanism rather than social media causing anxiety (Brown, 2023)."

Transition Phrases for Synthesis

Showing Agreement:

• "Similarly, Jones (2022) found..."
• "This finding is consistent with..."
• "Supporting this conclusion..."
• "Multiple studies confirm..."

Showing Disagreement:

• "However, Brown (2023) challenges this view..."
• "In contrast, some researchers argue..."
• "These findings contradict..."
• "The evidence remains mixed..."

Showing Gaps:

• "Despite this research, questions remain about..."
• "No studies have yet examined..."
• "Further research is needed to..."
• "A limitation of existing research is..."

Writing the Conclusion

Summarize and transition to your research:

Example:

"Current research establishes a clear link between social media use and adolescent anxiety, though the mechanisms remain debated. Most studies have focused on suburban, predominantly white populations, leaving questions about how these findings apply to diverse communities. Additionally, few studies have examined whether specific types of social media use (active vs. passive) have differential effects. The present study addresses these gaps by examining social media use patterns and anxiety symptoms in a diverse urban high school population."

Step 8: Revise and Polish

Self-Review Checklist

Content:

• Organized by theme, not source-by-source?
• Synthesizes rather than just summarizes?
• Includes critical analysis?
• Identifies gaps that justify your research?
• Covers all relevant aspects of your topic?

Writing:

• Clear topic sentences for each paragraph?
• Smooth transitions between paragraphs?
• Avoids excessive jargon?
• Appropriate length for your paper?

Sources:

• All claims supported by citations?
• Mix of recent and foundational sources?
• High-quality, peer-reviewed sources?
• Consistent citation format?

Common Mistakes to Avoid

Literature Review Examples

Example: Strong Opening

"Machine learning approaches to medical diagnosis have evolved rapidly over the past decade, with deep learning models now achieving physician-level accuracy in several imaging tasks (Liu et al., 2019). This review examines the application of these techniques to diabetic retinopathy screening, focusing on three critical questions: What accuracy levels have been achieved? What barriers prevent clinical implementation? And what approaches show promise for resource-limited settings?"

Example: Strong Synthesis Paragraph

"The relationship between screen time and sleep quality in adolescents has been extensively documented. A systematic review of 67 studies found that about 90% reported adverse associations between screen time and sleep, mainly shorter sleep and later sleep timing (Hale & Guan, 2015), and a meta-analysis found a strong, consistent association between bedtime media device use and inadequate sleep (Carter et al., 2016). Proposed mechanisms include light exposure suppressing melatonin production (Chang et al., 2015) and phone use after lights out, which has been linked to poorer sleep quality and more fatigue in adults as well (Exelmans & Van den Bulck, 2016). However, a large preregistered study found each hour of screen time was tied to only about 3 to 8 fewer minutes of sleep, suggesting that the context of screen use may matter more than raw screen time (Przybylski, 2019)."

Example: Identifying Gaps

"Despite substantial research on anxiety interventions for adolescents, significant gaps remain. First, school-based prevention programs produce only small effects, which shrink further by 12-month follow-up (Werner-Seidler et al., 2017). Second, evidence that cognitive behavioral therapy outperforms other treatments at follow-up remains limited and inconclusive (James et al., 2015). Third, treatment studies with ethnic minority youth have mostly had low statistical power and poor representation of less acculturated youth, raising questions about generalizability to diverse populations (Huey & Polo, 2008). The present study addresses the first and third gaps by examining a school-based mindfulness intervention in a diverse urban high school."

Getting Expert Help

Literature reviews are challenging. Expert guidance makes the process faster and the result stronger.

The YRI Fellowship provides:

• 1:1 PhD Mentorship: A PhD mentor guides you through the literature review over 10 weeks
• Source Recommendations: Mentors suggest key papers in your field
• Writing Feedback: Multiple rounds of review and revision
• Research Design: Ensure your review sets up your study effectively
• Publication: A first-author paper submitted to IEEE, Springer or Elsevier venues; 87% of Fellows publish

Apply to YRI Fellowship →

Related guides

• AP Research literature review: how to write one that scores

Frequently Asked Questions

How long should a literature review be? For a typical high school research paper, the literature review should be 2-4 pages (500-1000 words). For longer papers or theses, it might be 5-10 pages. It should be roughly 15-25% of your total paper length.

How many sources do I need? For high school research, aim for 15-25 quality sources. Quality matters more than quantity, 10 highly relevant, peer-reviewed articles are better than 30 tangentially related sources.

Can I include sources that contradict each other? Yes, you should. Showing that you understand debates in the field strengthens your review. Discuss why researchers disagree and what evidence supports each position.

Should I include my own opinions in the literature review? You should include your analysis and interpretation, but save your arguments for later sections. In the literature review, focus on what the research shows, identify patterns and gaps, but don't argue for your own conclusions yet.

How recent should my sources be? Include a mix of foundational sources (classic papers in your field) and recent research (last 5 years). For fast-moving fields like AI or medicine, prioritize recent sources.

What if I can't find research on my exact topic? This might be good: it could mean you've found a gap. Look for research on related topics and explain how your research extends into new territory.

Related Guides

• How to Write a Research Paper
• How to Choose a Research Topic
• How to Write a Research Abstract
• Research Paper Format Guide

Sources

• Meriam Library, California State University, Chico: Evaluating Information, the CRAAP Test
• arXiv: about arXiv (moderated, not peer reviewed; subject areas)
• WHO: blindness and vision impairment fact sheet
• Europe PMC: Hale and Guan 2015, screen time and sleep systematic review
• Europe PMC: Carter et al. 2016, bedtime media device use and sleep meta-analysis
• Europe PMC: Chang et al. 2015, light-emitting eReaders and melatonin
• Europe PMC: Exelmans and Van den Bulck 2016, bedtime mobile phone use and sleep in adults
• ScienceDaily: Przybylski study in The Journal of Pediatrics, screen time and children's sleep
• ANU Research Portal: Werner-Seidler et al. 2017, school-based depression and anxiety prevention meta-analysis
• Europe PMC: James et al. 2015, Cochrane review of CBT for childhood anxiety
• Europe PMC: Huey and Polo 2008, evidence-based treatments for ethnic minority youth
• Europe PMC: Liu et al. 2019, deep learning versus health-care professionals in medical imaging