This article provides a comprehensive guide to conducting a systematic literature review using the PRISMA guidelines and the PICO framework. It covers the five essential steps: framing and registering the review, building a defensible search strategy, screening with multiple reviewers, appraising study quality and extracting data, and reporting results according to PRISMA standards. Practical tips and tools are also discussed.
Systematic literature reviews are a cornerstone of scientific research, providing a rigorous and transparent method to synthesize existing knowledge on a specific question. If you need to conduct one, understanding the process and key frameworks like PICO and PRISMA is essential. This guide walks you through the five easy steps to perform a systematic literature review that is credible, reproducible, and respected.
A systematic literature review is a methodical and comprehensive synthesis of research studies on a particular topic or question. Unlike traditional literature reviews, systematic reviews follow a strict protocol to minimize bias and ensure transparency.
Before diving into the steps, it’s important to understand three key concepts:
Before starting your review, you must clearly define your research question and register your protocol. This step is often skipped but is crucial to demonstrate that your review is planned and not retrospective or cherry-picked.
For health sciences, register your review with PROSPERO, a free international database that approves registrations within days to weeks. PROSPERO registration locks in your question, eligibility criteria, search strategy, and analysis plan.
Most health journals now require a PROSPERO ID upon submission to ensure the review’s credibility.
If your review is outside health-related fields, consider using the Open Science Framework (OSF) to register your systematic review. OSF supports a broad range of disciplines and helps manage your research transparently.
PICO stands for:
For example, a vague question like "Does exercise help people with diabetes?" becomes:
In adults with type 2 diabetes, does a structured exercise program compared with usual care improve blood sugar control?
For qualitative research, a similar framework called PICo is used, where:
Example:
How do parents of children with autism experience implementing early interventions in early intervention settings?
Once your PICO question is clear, translate it into search terms using Boolean operators:
Example for Population (adolescents):
adolescent OR teenager OR teen OR youth OR young person
Example for Condition (depression):
depression OR depressive disorder
Example for Intervention (therapy):
cognitive behavioral therapy OR CBT OR talking therapy OR therapy
Combine all:
(adolescent OR teenager OR teen OR youth) AND (depression OR depressive disorder) AND (cognitive behavioral therapy OR CBT OR therapy)
Record all search strings, databases searched, dates, and any limits applied. Include gray literature such as theses, conference papers, and government reports if relevant.
University librarians are experts in search strategies and can help refine your search to ensure it is comprehensive and precise.
Screening is a critical step where you decide which studies to include based on your criteria.
This process reduces bias and increases reliability.
Use Cohen’s kappa statistic to measure agreement between reviewers:
Several software tools facilitate blind screening and tracking decisions, such as:
These tools help manage the screening process efficiently.
After screening, appraise the quality of included studies to assess risk of bias.
This step ensures your synthesis is based on high-quality evidence.
PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) provides a checklist and flow diagram to standardize reporting.
Go through the checklist to ensure you report:
The flow diagram visually represents the number of records identified, screened, excluded, and included.
Example flow:
You can generate flow diagrams using online tools to simplify this process.
Be honest about the limitations of your review. No review is perfect, and acknowledging weaknesses increases trustworthiness.
Conducting a systematic literature review is a rigorous but rewarding process that requires careful planning, execution, and reporting. By following these five steps—registering your review, developing a PICO question, building a search strategy, screening with multiple reviewers, appraising quality, and reporting with PRISMA—you ensure your review is credible and valuable to the scientific community.
For further guidance, explore resources on AI tools for literature reviews and detailed structures for writing your review.
Good luck with your systematic literature review—you are well on your way to producing high-quality, impactful research!
