Singlequestion

Singlequestion is a term used in survey methodology to describe an approach that relies on a single item to measure a specific construct, rather than a composite score derived from multiple items. It is contrasted with multi-item scales that aggregate several questions to assess a broader concept.

Design and evaluation of single questions require careful wording, clear context, and an appropriate response format (binary, Likert, or numeric). The item should directly reflect the underlying construct, minimize overlap with other concepts, and be tested for reliability and validity across populations. Pilot testing is common to assess how well the single question correlates with established measures.

Advantages of single questions include reduced respondent burden, shorter surveys, and potential use as quick screeners in clinical settings, customer feedback, or public opinion polling. They are particularly useful when time, cost, or privacy concerns limit longer instruments and when a rough or fast assessment is sufficient for decision-making.

Limitations and criticisms focus on reliability and depth. A single item may capture only a narrow aspect of a construct and be more susceptible to context effects, wording biases, and social desirability influences. It may fail to detect multi-dimensional structures or subtle changes, limiting interpretability for tracking over time or comparing across populations.

Examples of single questions include: “On a scale from 0 to 10, how satisfied are you with your experience today?” or “Do you consider your health to be good, fair, or poor?”

See also: survey methodology; single-item measures; Likert scale; patient-reported outcome measures.