What type of study design is especially useful for observing how stepfamilies change across years?

• A. Cross-sectional study
• B. Longitudinal study
• C. Case study
• D. Cohort study

Answer: (B)

To observe how stepfamilies change across years, you need a design that follows the same families over time. A longitudinal study does exactly that by measuring the same participants at multiple points, capturing how relationships, parenting roles, family structure, and child outcomes evolve year to year. This approach reveals trajectories, timing of transitions, and within-family changes, which a single snapshot cannot show.

In contrast, a cross-sectional study provides information at one moment and can’t track how things shift over time. A case study offers in-depth detail about a few families but isn’t intended to map changes across a broader population over many years. A cohort study follows a group with a shared starting point over time as well, which is a form of longitudinal research, but the overarching design that emphasizes observing change across years is best described as longitudinal.