A survey taking place at intervals over a long period is called a:

A survey taking place at intervals over a long period is called a:

• A. Cross-sectional survey
• B. Longitudinal survey
• C. Focus group
• D. Group interview

Answer: (B)

A survey taken at intervals over a long period is designed to observe how things change over time, so the same respondents or the same group are measured repeatedly to track trends and developments. This approach lets researchers see patterns, shifts in opinions, or changes in behavior across years. In contrast, a cross-sectional survey collects data at one point in time and provides a snapshot rather than a trajectory, so it can’t show how things evolve. Qualitative methods like focus groups or group interviews are typically conducted in one or a few sessions to explore views in depth, not to monitor changes over time. So the format described is a longitudinal survey.

A survey taken at intervals over a long period is designed to observe how things change over time, so the same respondents or the same group are measured repeatedly to track trends and developments. This approach lets researchers see patterns, shifts in opinions, or changes in behavior across years. In contrast, a cross-sectional survey collects data at one point in time and provides a snapshot rather than a trajectory, so it can’t show how things evolve. Qualitative methods like focus groups or group interviews are typically conducted in one or a few sessions to explore views in depth, not to monitor changes over time. So the format described is a longitudinal survey.