Answer: longitudinal.
Step-by-step explanation:
A longitudinal study is an analysis plan that requires to repeat measurements of the same variables over time, sometimes lasting many years, such as the 10-years in this example.
Longitudinal studies are frequently employed in psychology, to analyze behavioral changes from time to time; in developmental psychology, to examine developmental patterns over the life span; and in sociology, to analyze the life of different lifetimes or generations.