Answer:
Panel design
Explanation:
Panel design: In research, the term "panel design" is described as a phenomenon in which a researcher or an experimenter tends to sample a specific panel or group consisting of different participants or subjects and after that, he or she measures "variables of interest" or "a few specific variables" more than once from the same sample at different point in time.
In other words, panel design is a research technique to gather data more than once or repeatedly from specific participants who are being selected by the researcher.
In the question above, the given statement is an example of "panel design".