“Usefulness” in psychometrics

… we are surely not seriously considering the idea that we have to rule out rivals to the hypothesis that intelligence tests are useful. The Wechsler Adult Intelligence Scale (WAIS; Wechsler, 1955) comes in a big heavy box, which is very useful to hit people on the head with, but the hypothesis that the WAIS is valid for inflicting physical injury is certainly not the kind of hypothesis we are interested in.

From Borsboom, D., Mellenbergh, G.J., & Van Heerden (2004).  The concept of validity. Psychological Review, 111, 1061-1071