Answer:
Longitudinal study method
Step-by-step explanation:
The longitudinal study is like a cross-sectional study. It is like an observational study. in this study, the researcher does not interfere with the subject. In the longitudinal study, the researchers conduct several observations of the same subject for a long period. It can take several years for a study. With this study, researchers can find the development and changes in the participants. These studies can be extended beyond a single moment in time. In this process, the researcher can observe a single moment of behavior. We can say that the research should drive the design. these are very important research study when someone wants to study the effects of behavior or other developmental issues .