longitudinal
Definition
Longitudinal refers to a research design in which the same individuals are measured at multiple time points in order to capture change over time. The design is necessary for studying processes that unfold sequentially, such as shifts in political trust before and after the 2024 UK General Election, where data collected from 543 participants revealed a general post-election increase in trust that was moderated by collective action engagement and local electoral outcome. In acculturation research, however, repeated measurement across time points is frequently mistaken for a developmental perspective, when in fact a developmental approach is foremost a conceptual commitment to explaining continuity and discontinuity in behavior, cognition, and emotion across the lifespan. Longitudinal designs are a necessary but not sufficient condition for developmental science: purely cross-sectional designs do little to capture acculturation-related change, yet collecting data over multiple waves does not itself constitute a developmental framework.
Related Terms
- acculturation (1 shared article)
- cultural adaptation (1 shared article)
- development (1 shared article)
- lifespan (1 shared article)
- elections (1 shared article)
- collective action (1 shared article)
- political trust (1 shared article)
Applications
Longitudinal and Political Trust
Longitudinal data collection allows researchers to model within-person change in political trust across a defined political event rather than relying on cross-sectional comparisons between groups. In the 2024 UK General Election study, pre- and post-election measurements showed that trust increased broadly after the vote, but that this increase was attenuated among participants who had heavily invested in collective action and whose local candidate lost.
Sources: Marinthe et al. (2026)
Longitudinal and Acculturation
Longitudinal assessment has long been called for within acculturation research as the appropriate method for measuring acculturative change over time. Nevertheless, a genuinely developmental approach to acculturation requires more than multiple measurement points. It demands conceptual tools such as acculturation tempo and life-stage embedded designs that can account for differential trajectories across children, adolescents, and adults, and that clarify the optimal spacing of assessments based on how rapidly different groups adapt.
Sources: Jugert & Titzmann (2025)
