Module 7. Content Validity
A popular definition of validity is whether a test measures what it is intended to measure. More accurately, the process of validation does not seek to determine whether the test itself is valid, but rather whether the inferences and conclusions that are made on the basis of test scores are valid (Murphy & Davidshofer, 2001). The traditional concept of validity considered several seemingly independent strategies for establishing the validity of a test, including content validation, criterion-related validation, and construct validation. Today, we recognize that all evidence examined in relation to the inferences and conclusions of test scores contributes to the same process: validation. Although we recognize validity as a unified construct, Modules 7, 8, and 9 each provide a discussion of the issues involved in the various traditional approaches to validation.