ABSTRACT
Validity is concerned with establishing evidence for the use of a particular measure or instrument in a particular setting with a particular population for a specific purpose. In this chapter we discuss what we call measurement validity; others might use terms such as test validity, score validity, or just validity. We use the modifier measurement to distinguish it from internal, external, and overall research validity (discussed in chaps. 17–19) and to point out that it is the measures or scores that provide evidence for validity. It is inappropriate to say that a test is “valid” or “invalid.”
