+A **longitudinal study** tracks the same subjects repeatedly over an extended period. This [Research Design](/wiki/research_design) reveals patterns of [Change](/wiki/change) and development, offering insight into processes unfolding over time.
+## See also
+- [Cohort Study](/wiki/cohort_study)
+- [Cross-sectional Study](/wiki/cross_sectional_study)
+- [Data Collection](/wiki/data_collection)