Searches used for systematic reviews require more planning and preparation compared with traditional reviews, to ensure that they are comprehensive and rigorous.
You will first need to define your search question. Using a research question framework can be helpful in planning your strategy.
Formulating an answerable search question is essential to finding the best evidence for your topic. You can use the research question frameworks to help you structure your search question and enable you to find the information you need most effectively. There are a range of different frameworks available, and the one you use will depend on whether your review plans to explore quantitative or qualitative evidence and the specific purpose of your review.
The formulating a search question guide provides an introduction to using research question frameworks in practice.
PICO is a method of searching for evidence, commonly used within health and medicine. It helps to break down a clinical scenario and turn it into a clinical question. The formulating a search question guide provides an introduction to using PICO in practice.
The majority of research questions will have an identifiable population and intervention (or 'indicator'). These concepts will form the key parts of your search strategy. When using the framework, it's not necessary to use every category, the categories are simply there to guide you in forming a evidence-based question. Many clearly defined questions do not have a comparison or control to consider, so don't worry if this category isn't applicable for your topic.
Thinking about the Outcome you are interested in can help you focus your topic of interest. Systematic search strategies do not usually include search terms for outcomes, as these may affect the sensitivity of the search (i.e. you may miss relevant results).
Complete module three of Cochrane Interactive Learning 'searching for studies' to learn more.
If your research doesn't look at clinical effectiveness, there are other frameworks available to help you structure your question. Take a look at this guide for examples.
The PEO framework is useful for building research questions that have a qualitative focus.
|
P |
Population and their problems
|
|
E |
Exposure
|
|
O |
Outcomes or themes
|
Example:
|
P |
Population and their problems |
Nurses |
|
E |
Exposure |
Revalidation |
|
O |
Outcomes or themes |
Attitudes, feelings, views |
Example question: What are nurses attitudes towards revalidation?
The SPICE framework is useful for social sciences topics, or qualitative research questions that require subjective evaluation.
| S | Setting - where? |
| P | Perspective - for whom? |
| I | Intervention - what? |
| C | Comparison - compared with what? |
| E | Evaluation - with what result? |
Example:
| S | Setting - where? | Exeter |
| P | Perspective - for whom? | University students |
| I | Intervention - what? | Pet therapy |
| C | Comparison - compared with what? | No support |
| E | Evaluation - with what result? | Students' self-reported stress levels before exams |
The SPIDER framework has been designed to help you find qualitative and mixed-method studies.
| S | Sample |
| PI | Phenomenon of interest |
| D | Design |
| E | Evaluation |
| R | Research type |
Example:
| S | Sample | Teen parents |
| PI | Phenomenon of interest | Pregnancy |
| D | Design | Questionnaire |
| E | Evaluation | Experiences |
| R | Research type | Qualitative |