A longitudinal approach is where a group of participants is followed up after a period of time.
Longitudinal studies are often found in the area of developmental psychology because they are ways of studying change over time. The longitudinal approach may suffer from attrition which refers to the loss of participants from a study. Reasons for attrition might include participants no longer wanting to take part in the study, moving away or losing contact. When attrition occurs psychologists have to question the representativeness of the remaining sample.
- They use the same participants - meaning participants variables will not give bias in the results.
- Useful for looking at developmental trends. They…