In other words, does it “look like” it will measure what it should do. For example, a questionnaire aiming to score anxiety should include questions aimed at a broad range of features of anxiety.įace validity is the degree to which a test is subjectively thought to measure what it intends to measure. Construct validity subsumes the other types of validity.Ĭontent validity describes whether an instrument is systematically and comprehensively representative of the trait it is measuring.
For example, a measure of intelligence should only assess factors relevant to intelligence and not, for instance, whether someone is a hard worker. There are four main types of validity:Ĭonstruct validity is the extent to which the instrument specifically measures what it is intended to measure, and avoids measuring other things. This is important if the results of a study are to be meaningful and relevant to the wider population. Validity is the extent to which an instrument, such as a survey or test, measures what it is intended to measure (also known as internal validity). We are currently in the process of updating this chapter and we appreciate your patience whilst this is being completed.
