The term and concept "operationalization" is an important component of finalizing a research question. Often, we think that measuring constructs is straightforward, and for some variables (e.g., age), it can be. For others, however, it can be complex. For this exercise,

Select construct of your interest which is depression.

Discuss various approaches to its measurement.

And then Please review the peer-reviewed literature to see how other research studies have operationalized this concept.