Literature Review Planner
Comprehensive frameworks for planning, conducting, and synthesizing literature reviews across academic and professional research contexts.
Review Types
| Type | Purpose | Scope | Methodology Rigor | Best For | |------|---------|-------|-------------------|----------| | Narrative | Broad overview of a topic | Wide, flexible | Low-Medium | Background sections, introductions | | Systematic | Answer a specific research question | Narrow, predefined | High | Evidence-based decisions, clinical practice | | Scoping | Map available evidence on a topic | Wide, structured | Medium | Emerging fields, identifying gaps | | Meta-Analysis | Quantitative synthesis of findings | Narrow, statistical | Highest | Combining effect sizes, treatment efficacy | | Rapid | Timely evidence synthesis | Focused, abbreviated | Medium | Policy decisions, time-constrained contexts | | Umbrella | Review of existing reviews | Reviews only | High | Overarching evidence synthesis | | Integrative | Synthesize diverse methodologies | Wide, mixed methods | Medium | Combining qualitative and quantitative |
Choosing the Right Review Type
Do you need to answer a specific, focused question?
YES --> Is quantitative synthesis of effect sizes needed?
YES --> Meta-Analysis
NO --> Systematic Review
NO --> Do you need to map the breadth of evidence?
YES --> Is the field well-established?
YES --> Umbrella Review (review of reviews)
NO --> Scoping Review
NO --> Do you need to combine qualitative and quantitative?
YES --> Integrative Review
NO --> Is time constrained (< 3 months)?
YES --> Rapid Review
NO --> Narrative Review
Search Strategy Development
PICO/PEO Framework
Use structured frameworks to define your research question:
| Framework | Element | Description | Example | |-----------|---------|-------------|---------| | PICO | Population | Who is being studied | Adults with Type 2 diabetes | | | Intervention | What treatment/exposure | Telemedicine consultations | | | Comparison | Alternative to intervention | In-person consultations | | | Outcome | What is measured | HbA1c levels, patient satisfaction | | PEO | Population | Who is being studied | Software engineering teams | | | Exposure | Phenomenon of interest | Agile methodology adoption | | | Outcome | What is measured | Productivity, code quality |
Database Selection
| Database | Coverage | Best For | |----------|----------|----------| | PubMed/MEDLINE | Biomedical, life sciences | Clinical, medical, health research | | Scopus | Multidisciplinary, broadest | Cross-disciplinary reviews | | Web of Science | Multidisciplinary, citation data | Citation analysis, impact tracking | | IEEE Xplore | Engineering, computer science | Technical and computing research | | PsycINFO | Psychology, behavioral science | Mental health, cognition research | | ERIC | Education | Teaching, learning, education policy | | CINAHL | Nursing, allied health | Nursing and health professions | | Cochrane Library | Systematic reviews, trials | Clinical intervention evidence | | Google Scholar | Broad, grey literature | Supplementary searching, snowballing | | Preprint servers | arXiv, bioRxiv, SSRN | Cutting-edge, unpublished work |
Keyword and Boolean Strategy
BUILDING A SEARCH STRING:
Step 1: Identify key concepts from PICO/PEO
Concept 1: "telemedicine" OR "telehealth" OR "remote consultation" OR "virtual care"
Concept 2: "diabetes" OR "type 2 diabetes" OR "T2DM" OR "diabetes mellitus"
Concept 3: "glycemic control" OR "HbA1c" OR "blood glucose" OR "patient outcomes"
Step 2: Combine with Boolean operators
(Concept 1) AND (Concept 2) AND (Concept 3)
Step 3: Apply filters
- Date range: 2015-2025
- Language: English
- Study type: RCT, cohort, systematic review
- Peer-reviewed only
ADVANCED OPERATORS:
"exact phrase" - Exact match
* - Truncation (therap* = therapy, therapies, therapeutic)
MeSH terms - Controlled vocabulary (PubMed)
NEAR/3 - Proximity (terms within 3 words)
ti,ab - Title and abstract search
Search Documentation Template
SEARCH LOG:
Database: [Name]
Date Searched: [Date]
Search String: [Full query]
Filters Applied: [Date, language, study type]
Results Retrieved: [Count]
Results After Deduplication: [Count]
Notes: [Any issues, modifications needed]
PRISMA Flow Diagram
IDENTIFICATION
Records identified through database searching: n = ___
Records identified through other sources: n = ___
|
v
Records after duplicates removed: n = ___
|
SCREENING
v
Records screened (title/abstract): n = ___
Records excluded: n = ___
|
v
Full-text articles assessed for eligibility: n = ___
Full-text articles excluded (with reasons): n = ___
- Reason 1: n = ___
- Reason 2: n = ___
- Reason 3: n = ___
|
INCLUDED
v
Studies included in qualitative synthesis: n = ___
Studies included in quantitative synthesis (meta-analysis): n = ___
Inclusion/Exclusion Criteria
| Criterion | Include | Exclude | |-----------|---------|---------| | Population | [Define target population] | [Define excluded populations] | | Intervention/Exposure | [Define relevant interventions] | [Define excluded interventions] | | Outcome | [Define relevant outcomes] | [Outcomes not of interest] | | Study Design | [Accepted study types] | [Excluded study types] | | Date Range | [Start year] to [End year] | Outside date range | | Language | [Accepted languages] | Other languages | | Publication Type | Peer-reviewed journals | Editorials, letters, conference abstracts |
Source Evaluation
Critical Appraisal Tools by Study Design
| Study Design | Appraisal Tool | Key Domains | |-------------|---------------|-------------| | RCTs | Cochrane Risk of Bias (RoB 2) | Randomization, blinding, attrition, reporting | | Cohort Studies | Newcastle-Ottawa Scale (NOS) | Selection, comparability, outcome assessment | | Case-Control | Newcastle-Ottawa Scale (NOS) | Selection, comparability, exposure assessment | | Qualitative | CASP Qualitative Checklist | Aims, methodology, recruitment, data, analysis, ethics | | Cross-Sectional | JBI Critical Appraisal | Inclusion, measurement, confounders, analysis | | Diagnostic | QUADAS-2 | Patient selection, index test, reference standard, flow | | Mixed Methods | MMAT | Qualitative, quantitative, mixed methods criteria |
Source Quality Assessment Framework
QUALITY SCORING (rate each 1-5):
RELEVANCE:
- Directly addresses research question? ___
- Population matches target? ___
- Outcomes align with review objectives? ___
METHODOLOGICAL RIGOR:
- Study design appropriate? ___
- Sample size adequate? ___
- Bias minimized? ___
- Statistical analysis appropriate? ___
CREDIBILITY:
- Published in peer-reviewed journal? ___
- Authors have relevant expertise? ___
- Funding sources declared? ___
- Conflicts of interest addressed? ___
RECENCY:
- Published within target date range? ___
- Findings still applicable? ___
- Not superseded by newer evidence? ___
TOTAL SCORE: ___ / 60
High quality: 48-60
Medium quality: 36-47
Low quality: < 36
Hierarchy of Evidence
EVIDENCE PYRAMID (highest to lowest):
Level 1: Systematic Reviews & Meta-Analyses
Level 2: Randomized Controlled Trials (RCTs)
Level 3: Cohort Studies (prospective)
Level 4: Case-Control Studies
Level 5: Cross-Sectional Studies / Case Series
Level 6: Expert Opinion / Editorials
Level 7: Anecdotal / Narrative Reports
Citation Management
Workflow
CITATION MANAGEMENT PROCESS:
1. COLLECT
- Export references from databases (RIS, BibTeX, EndNote XML)
- Import into reference manager (Zotero, Mendeley, EndNote)
- Attach PDFs where available
2. ORGANIZE
- Create folder structure mirroring review themes
- Tag with inclusion/exclusion status
- Tag with quality rating
- Add notes and annotations
3. DEDUPLICATE
- Run automatic deduplication
- Manual review of near-duplicates
- Document count removed
4. SCREEN
- Title/abstract screening (tag: include/exclude/maybe)
- Full-text screening (tag: include/exclude with reason)
- Track screening decisions
5. EXTRACT
- Populate data extraction form
- Link to source reference
- Note discrepancies
Data Extraction Template
EXTRACTION FORM:
Study ID: ___
Authors: ___
Year: ___
Title: ___
Journal: ___
Study Design: ___
Country/Setting: ___
Population:
- Sample size: ___
- Demographics: ___
- Inclusion criteria: ___
Intervention/Exposure: ___
Comparison/Control: ___
Outcomes:
- Primary: ___
- Secondary: ___
- Measurement tools: ___
Key Findings: ___
Effect Size (if applicable): ___
Confidence Interval: ___
Quality Rating: ___
Reviewer Notes: ___
Synthesis Frameworks
Thematic Synthesis
THEMATIC SYNTHESIS STEPS:
1. CODE: Read included studies and assign descriptive codes
2. ORGANIZE: Group related codes into descriptive themes
3. DEVELOP: Generate analytical themes that go beyond the primary studies
4. MAP: Create a thematic map showing relationships between themes
5. WRITE: Narrate findings organized by analytical themes
THEMATIC MAP STRUCTURE:
Overarching Theme
|-- Sub-theme 1
| |-- Code A (Studies 1, 3, 7)
| |-- Code B (Studies 2, 5)
|-- Sub-theme 2
| |-- Code C (Studies 1, 4, 6)
| |-- Code D (Studies 3, 8)
Chronological Synthesis
Best for showing how understanding of a topic has evolved over time.
CHRONOLOGICAL STRUCTURE:
Era 1 (e.g., 2000-2010): Foundational Work
- Key studies and their contributions
- Prevailing theories and methods
Era 2 (e.g., 2010-2018): Methodological Advances
- New approaches introduced
- Challenges to earlier findings
Era 3 (e.g., 2018-Present): Current State
- Latest findings and debates
- Emerging directions
Methodological Synthesis
Group studies by methodology to compare how different approaches yield different insights.
| Methodology | Studies | Key Findings | Strengths | Limitations | |-------------|---------|-------------|-----------|-------------| | RCTs | [list] | [summary] | Causal inference | Generalizability | | Qualitative | [list] | [summary] | Rich context | Subjectivity | | Mixed Methods | [list] | [summary] | Comprehensive | Complexity | | Observational | [list] | [summary] | Real-world validity | Confounding |
Gap Identification
Gap Analysis Framework
GAP CATEGORIES:
KNOWLEDGE GAPS:
- What questions remain unanswered?
- Where do findings conflict?
- What populations are understudied?
METHODOLOGICAL GAPS:
- What study designs are missing?
- Are sample sizes consistently too small?
- Are measurement tools validated?
CONTEXTUAL GAPS:
- What geographic regions are underrepresented?
- What settings haven't been studied?
- Are there temporal gaps in the literature?
PRACTICAL GAPS:
- What interventions haven't been tested?
- Where does evidence fail to translate to practice?
- What implementation barriers are unaddressed?
Gap Documentation Template
GAP: [Brief description]
EVIDENCE: [What the current literature shows / doesn't show]
SIGNIFICANCE: [Why this gap matters]
SUGGESTED RESEARCH: [What future studies could address this]
PRIORITY: [High / Medium / Low]
Writing Structure
Literature Review Sections
STRUCTURE:
1. INTRODUCTION (10-15% of word count)
- Context and importance of the topic
- Scope and objectives of the review
- Research question(s)
- Brief overview of structure
2. METHODOLOGY (15-20% for systematic; shorter for narrative)
- Search strategy and databases
- Inclusion/exclusion criteria
- Screening process (PRISMA for systematic)
- Quality assessment approach
- Data extraction method
- Synthesis approach
3. FINDINGS / RESULTS (40-50%)
- Organized by themes, chronology, or methodology
- Summary tables of included studies
- Critical analysis (not just description)
- Comparison and contrast across studies
- Quality assessment results
4. DISCUSSION (15-20%)
- Synthesis of key findings
- Comparison with existing reviews
- Implications for theory and practice
- Strengths and limitations of the review
5. GAPS AND FUTURE DIRECTIONS (5-10%)
- Identified gaps in knowledge
- Recommended research priorities
- Methodological recommendations
6. CONCLUSION (5%)
- Summary of main findings
- Answer to research question
- Key implications
Common Pitfalls
| Pitfall | Description | Prevention | |---------|-------------|------------| | Cherry-picking | Selecting only studies that support a hypothesis | Pre-register protocol, follow PRISMA | | Narrative bias | Describing studies without critical analysis | Use appraisal tools, compare across studies | | Scope creep | Expanding focus beyond original question | Stick to predefined inclusion criteria | | Recency bias | Over-weighting recent studies | Include full date range, weight by quality | | Publication bias | Missing grey literature and null results | Search preprints, dissertations, trial registries | | Inadequate search | Too few databases or narrow search terms | Minimum 3 databases, iterative search refinement | | Poor synthesis | Listing studies instead of integrating findings | Use synthesis frameworks, identify patterns | | Missing protocol | No pre-registered review protocol | Register on PROSPERO or OSF before starting |
Review Protocol Template
PROTOCOL:
Title: [Review title]
Registration: [PROSPERO/OSF ID]
Authors: [Names and roles]
Date: [Protocol date]
Background: [Why this review is needed]
Objectives: [What the review aims to achieve]
Research Question: [PICO/PEO formatted question]
Eligibility Criteria:
Inclusion: [List]
Exclusion: [List]
Information Sources: [Databases and other sources]
Search Strategy: [Full search string per database]
Study Selection:
- Stage 1: Title/abstract screening (2 independent reviewers)
- Stage 2: Full-text screening (2 independent reviewers)
- Disagreement resolution: [Process]
Data Extraction: [What data will be extracted]
Quality Assessment: [Which tool(s) will be used]
Synthesis Method: [Narrative, thematic, meta-analysis]
Timeline: [Planned completion date]