Longitudinal studies uses a group of people over an extended period of time so as to study. A disadvantage of the longitudinal design is that Participants may die, drop out, or move away.
The main disadvantage of using longitudinal studies for research is that long-term research often increases the chances of unpredictable outcomes. that is If the same people cannot be found for a study update, then the research ceases.
The Research time is another disadvantage of longitudinal surveys as long-term research do give unpredictable results.
An example is if the same individual is not found to update the study, the research may not be carried out.
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