ABSTRACT
Our first boss had a favorite way of responding to junior psychologists who would troop
into his office on a weekly basis, proudly displaying the latest tests that they had devised
to measure the effectiveness of some training manipulation. “Yes, yes, yes,” he would say
as someone rhapsodized about how cool or clever her new test was, “but is it diagnostic?”
There is a lot of insight in that question. It’s not enough, when you are designing or
