A survey design that collects data from the same people at multiple points in time is called a longitudinal survey.

• A. Cross-sectional survey
• B. Longitudinal survey
• C. Time-series survey
• D. Prospective cohort study

Answer: (B)

The main idea being tested is tracking the same people over several points in time to see how individuals change. When you collect data from the same respondents at multiple moments, you can observe how attitudes, behaviors, or outcomes develop within the same persons, rather than comparing different people each time. This is why the term that fits best is the longitudinal survey.

Think of a study that interviews the same group of students every year for five years to see how their views on school change. That kind of repeated measurement on the same individuals shows change over time, which is exactly what a longitudinal design is designed to capture.

A snapshot at one moment wouldn’t show change, so a cross-sectional survey isn’t it. A time-series approach often looks at trends over time but not necessarily the same individuals, focusing more on patterns in a population or a single variable over time. A prospective cohort study follows a defined group over time to observe outcomes, and while it can involve repeated data collection, its emphasis is on exposure and outcome relationships rather than repeated surveys of attitudes or behaviors.