Considering the situation described above, the researcher is believed to be conducting a "Longitudinal study."
This is because a longitudinal study is a type of research conducted using the same variable over a long period.
A longitudinal study can be carried out to last in weeks, months, years, or decades.
Thus, when a researcher administers a personality test to the same children every three years as they progress through school, this is an example of a longitudinal study.
There are various types of longitudinal study; this includes the following:
- Cohort studies;
- Panel studies;
- Record-linkage studies.
Hence, in this case, it is concluded that the correct answer is "Longitudinal study."
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