Which design allows for both longitudinal and cross-sectional comparisons?

Which design allows for both longitudinal and cross-sectional comparisons?

• A. Case study design.
• B. Ethnography design.
• C. Sequential design.
• D. Descriptive design.

Answer: (C)

This item tests a research approach that lets researchers compare development across ages while also tracking changes over time. A sequential design combines longitudinal and cross-sectional elements by studying multiple cohorts over several time points. By collecting data from different age groups at the same time (cross-sectional aspect) and then following those groups as they age (longitudinal aspect), it provides both kinds of comparisons. This setup helps tease apart aging effects from cohort and period effects and can be more efficient than running only a long-term study while still offering insights into how individuals change over time. The other designs aren’t built to provide both longitudinal and cross-sectional comparisons. A case study focuses on in-depth study of one person or a small group, not across multiple cohorts or time points. Ethnography involves immersive qualitative study of a culture or community, not structured comparisons over time or ages. A descriptive design describes characteristics of a population at a single point in time, lacking the repeated measures needed for longitudinal or cross-sectional developmental comparisons.

This item tests a research approach that lets researchers compare development across ages while also tracking changes over time. A sequential design combines longitudinal and cross-sectional elements by studying multiple cohorts over several time points. By collecting data from different age groups at the same time (cross-sectional aspect) and then following those groups as they age (longitudinal aspect), it provides both kinds of comparisons. This setup helps tease apart aging effects from cohort and period effects and can be more efficient than running only a long-term study while still offering insights into how individuals change over time.

The other designs aren’t built to provide both longitudinal and cross-sectional comparisons. A case study focuses on in-depth study of one person or a small group, not across multiple cohorts or time points. Ethnography involves immersive qualitative study of a culture or community, not structured comparisons over time or ages. A descriptive design describes characteristics of a population at a single point in time, lacking the repeated measures needed for longitudinal or cross-sectional developmental comparisons.