What Should a Strong Research Question Look Like?
A strong research question is not just picking an interesting topic. It clarifies who the study includes, which variable is examined, what it is compared against, and which outcome matters.
A well-formed question shapes study design, data collection, the analysis plan, and how results should be interpreted.
PICO and PECO frameworks
| Model | Expansion | When to use |
|---|---|---|
| PICO | Population / Intervention / Comparison / Outcome | Best for interventional or clinical effectiveness questions. |
| PECO | Population / Exposure / Comparison / Outcome | Best for observational, etiologic, or risk-factor research. |
What a strong research question includes
| Component | Purpose |
|---|---|
| Population | Defines who the study includes. |
| Intervention / Exposure | Names the treatment, intervention, risk factor, or variable under study. |
| Comparison | States what the main variable is compared against. |
| Outcome | Defines the primary endpoint to measure. |
| Measurability | Ensures the question can be answered with data. |
| Focus | Keeps the question narrow enough to be feasible. |
Weak vs strong research questions
Weak research questions
- Too broad
- Population not defined
- No comparison
- Outcome unclear
- Hard to test with data
- Does not guide study design
Example: “Does screen time affect sleep?”
Interesting—but not structured enough.
Strong research questions
- Specific and structured
- Variables clearly defined
- Includes a comparison
- States a measurable outcome
- Clinically or scientifically meaningful
- Guides the analysis plan
Example: “Among adolescents, is high evening screen time, compared with low evening screen time, associated with poorer sleep quality over 12 months?”
Practical checklist
When drafting a research question, ask:
- Is the population clear?
- Is the intervention or exposure defined?
- Is there a comparison?
- Is the outcome measurable?
- Is the question focused and feasible?
- Does it match the study design?
Core message
A strong research question rests on this formula:
- Who?
- Which intervention or exposure?
- Compared to what?
- Which outcome?
In short
A strong research question is not just interesting—it must be structured, focused, and answerable.
After clarifying your question, see our methods section and abstract guides—or run a pre-submission review to check consistency before you submit.
Test your research question before submission
Get reviewer-style feedback on design, methods, and outcome alignment.
Evaluate your manuscript