Content Validity
Content validity is one of the 3 main types of validity and refers to “the degree to which the content of an instrument adequately reflects the construct being measured”1. Content validity represents an early and purely qualitative to enhance construct validity of an instrument based on subjective judgments by an examiner1.
Claims about the validity of an instrument should never be based exclusively on evidence of adequate content validity1
Relevance
Relevant Situations
According to Polit, content validity is relevant in studies which involved developing a new instrument1.
Irrelevant Situations
Oppositely, Polit stated that content validity was not necessary with existing instruments. Such as texting an existing instrument in a new population, adapting or revising an existing instrument, or translating an existing instrument1. It should be noted that this was an example, and should not be applied universally.