In a short essay, list and discuss the three ways in which researchers may assess validity

What will be an ideal response?

a. Content validity involves a systematic but subjective assessment of how well a scale measures the construct or variable of interest. Content validity alone is not a sufficient measure of the validity of a scale. It must be supplemented with a more formal evaluation of the scale's validity, namely, criterion validity and construct validity.
b. Criterion validity reflects whether a scale performs as expected given other variables considered relevant to the construct. These variables are called criterion variables. They may include demographic and psychographic characteristics, attitudinal and behavioral measures, or scores obtained from other scales.
c. Construct validity addresses the question of what construct or characteristic the scale is, in fact, measuring. In order to assess construct validity, the researcher must have a strong understanding of the theory that provided the basis for constructing the scale.