What is a sequential design?

What is a sequential design?

• A. A design where the same groups of different aged people are studied repeatedly as they change ages.
• B. A design that only compares two age groups.
• C. A design where all participants are the same age.
• D. A design focusing on one cohort over time.

Answer: (D)

Sequential design brings together cross-sectional and longitudinal elements by studying several age groups (cohorts) over time. This approach follows multiple cohorts as they age, collecting data at multiple waves, which helps separate aging effects from cohort and time-of-measurement effects. In contrast, focusing on one cohort over time describes a purely longitudinal study, while comparing only two age groups or studying all participants at the same age describes cross-sectional or single-age designs. So the essence of sequential design is tracking multiple cohorts across time to disentangle how people change with age from differences due to their birth cohort.

Sequential design brings together cross-sectional and longitudinal elements by studying several age groups (cohorts) over time. This approach follows multiple cohorts as they age, collecting data at multiple waves, which helps separate aging effects from cohort and time-of-measurement effects. In contrast, focusing on one cohort over time describes a purely longitudinal study, while comparing only two age groups or studying all participants at the same age describes cross-sectional or single-age designs. So the essence of sequential design is tracking multiple cohorts across time to disentangle how people change with age from differences due to their birth cohort.