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What Is a Research Question? Types, Examples & How to Write One | CASRAI

A research question is the specific, focused question that a study is designed to answer. It defines the scope and direction of the research, shapes the methodology chosen, and determines what counts as a relevant finding. A well-constructed research question is the foundation of any rigorous study.

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What makes a good research question

A good research question is focused enough to be answered within the scope and timeframe of the study, but broad enough to be interesting and significant. It is answerable — meaning the relevant data can be collected and analysed — and relevant to an ongoing debate or practical problem. The FINER criteria (Feasible, Interesting, Novel, Ethical, Relevant) provide a structured quality check. A question that is too broad ("What causes mental health problems?") cannot be answered rigorously in a single study; one that is too narrow may lack significance or novelty.

Types of research questions

Research questions are often classified by the type of knowledge they seek. Descriptive questions ask what is happening ("What proportion of published trials report protocol deviations?"). Comparative questions ask how groups or conditions differ ("Do women and men differ in self-reported research productivity?"). Causal questions ask whether X causes Y, requiring experimental or quasi-experimental designs ("Does a structured mentoring programme improve PhD completion rates?"). Exploratory questions open up new territory where theory is underdeveloped ("What barriers do early-career researchers in low-income countries face in accessing open-access publishing?").

PICO and PICOTS in health sciences

In clinical and health research, the PICO framework structures the research question around four components: Population (which patients or group?), Intervention (what treatment or exposure?), Comparator (compared to what?), and Outcome (what will be measured?). Extended versions add T (Timeframe) and S (Setting) to give PICOTS. Structuring the question this way makes the search strategy for a systematic review more systematic and reproducible, and makes the inclusion and exclusion criteria for study selection more explicit.

Research question vs research problem vs hypothesis

A research problem is the broad area of concern that motivates the study — a gap, contradiction, or practical issue in existing knowledge. A research question narrows this into a specific, answerable question about a particular population, phenomenon, or relationship. A research hypothesis goes one step further: it is a specific, testable prediction about the expected answer to the research question, stating the anticipated relationship between variables. Not all studies have hypotheses — exploratory and qualitative studies often work with research questions only — but all studies have at least one research question.

Key facts

At a glance

Definition: A specific, focused, answerable question that drives a study
FINER: Feasible, Interesting, Novel, Ethical, Relevant — a quality checklist
Types: Descriptive, comparative, causal, exploratory
PICO/PICOTS: Health sciences framework: Population, Intervention, Comparator, Outcome
Vs problem: A research problem is the broad concern; the question is the precise focus
Vs hypothesis: A hypothesis predicts the answer; a question leaves it open

Common misconceptions

What people often get wrong

Often heard: A research question and a thesis statement are the same thing.

Actually: No — a research question asks what the study will investigate; a thesis statement (in a dissertation) is the researcher's answer to that question, typically stated at the end of the introduction chapter.

Often heard: Every study needs a hypothesis, not just a research question.

Actually: No — quantitative experimental studies commonly use hypotheses, but exploratory, qualitative, and many mixed-methods studies operate with research questions. The choice depends on the state of theory in the field and the research design.

Often heard: A broad research question is better because it covers more ground.

Actually: No — a broad question is often unfeasible and produces shallow findings. Specificity is a virtue: a focused question can be answered rigorously, and a well-answered narrow question adds more to knowledge than a vague broad one.

Going deeper