Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

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."

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