Describe what a longitudinal design is and discuss out one strength and three weaknesses.

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The Answer is A longitudinal design uses one group of participants and repeatedly measures them over a period of time. This approach generally involves at least two different time points at which participants are measured. A clear strength of this approach is that it allows researchers to make strong inferences about underlying processes of development and change.
This method also has several weaknesses. The biggest practical issue is that it involves long periods of time, and intense use of resources. A second weakness is that the participants undergo repeated testing, and in some cases it can influence the quality of the data and the validity of the findings. Finally, longitudinal studies often need to deal with subject attrition. If the study is over a long duration, some subjects might inevitably drop out influencing the sample size and might cause some selection bias.

Describe What a Longitudinal Design Is and Discuss Out One