A design that follows the same participants over time to observe changes as they age is known as which type of study?

A design that follows the same participants over time to observe changes as they age is known as which type of study?

• A. Longitudinal
• B. Ethnographic
• C. Sequential
• D. Case study

Answer: (A)

Tracking the same participants over time to observe changes as they age is a longitudinal study. By collecting data from the same individuals at multiple points, researchers can see how each person develops and ages, capturing within-person change and how early factors relate to later outcomes. This approach helps separate aging effects from differences between groups born at different times (cohort effects) and can reveal the timing and patterns of developmental changes, though it requires long-term follow-up and can lose participants along the way. Other designs differ in focus: ethnographic studies explore culture through in-depth field immersion and aren’t defined by repeated measurement of the same individuals to map aging; sequential designs follow multiple cohorts over time to separate age, period, and cohort effects, rather than tracking the same individuals alone; case studies examine a single person or a small group in depth rather than aging trajectories across a larger sample.

Tracking the same participants over time to observe changes as they age is a longitudinal study. By collecting data from the same individuals at multiple points, researchers can see how each person develops and ages, capturing within-person change and how early factors relate to later outcomes. This approach helps separate aging effects from differences between groups born at different times (cohort effects) and can reveal the timing and patterns of developmental changes, though it requires long-term follow-up and can lose participants along the way. Other designs differ in focus: ethnographic studies explore culture through in-depth field immersion and aren’t defined by repeated measurement of the same individuals to map aging; sequential designs follow multiple cohorts over time to separate age, period, and cohort effects, rather than tracking the same individuals alone; case studies examine a single person or a small group in depth rather than aging trajectories across a larger sample.