is an experimental design for research studies which typically occur longer than short-term research, usually over a number of years or with a long period of time in-between the gathering of initial research and the conclusion of the study.

LONGITUDINAL DESIGN: "Longitudinal, in the context of a study, involves data collection over a long period of time giving rise to rich qualitative data."
Cite this page: N., Pam M.S., "LONGITUDINAL DESIGN," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/longitudinal-design/ (accessed April 13, 2021).