in what ways does the data gathered in longitudinal research differ from information gathered in a one-off interview or questionnaire?

Time Frame: Longitudinal research is conducted over a long period of time, often years or even decades. This allows researchers to track changes and developments in the subject matter over time. On the other hand, a one-off interview or questionnaire is conducted at a single point in time, providing a snapshot of the subject matter at that particular moment.

Depth of Data: Because longitudinal research is conducted over a long period of time, it can provide a deeper understanding of the subject matter. It allows researchers to observe trends, patterns, and changes over time. In contrast, a one-off interview or questionnaire can only provide information about the subject matter at a specific point in time.

Consistency of Data: In longitudinal research, the same subjects are often studied over time. This allows for a consistent data set, as the same individuals are providing information. In a one-off interview or questionnaire, the subjects may vary, leading to inconsistencies in the data.

Complexity of Analysis: Longitudinal research often involves more complex analysis due to the time factor and the need to track changes over time. A one-off interview or questionnaire, on the other hand, involves a simpler analysis as it only involves data from a single point in time.

Cost and Resources: Longitudinal research is often more costly and resource-intensive due to the long duration and the need for consistent follow-up with the subjects. A one-off interview or questionnaire is usually less costly and requires fewer resources as it is conducted once.