“There is a great deal more in what Cronbach and Messick have suggested [regarding validity] than is acknowledged or accepted by the field.”

(Shepard, 1993, p. 406)

Notes:

The exact interpretation for this quote is not certain. Lorrie Shepard might have been saying Lee Cronbach and Samuel Messick were obtuse. But the most optimistic reading is that the field generally has not caught up with some of the very basics of modern validity theory.