Using “the little gray cells” is an expression the legendary detective Hercule Poirot, created by Agatha Christie, was often fond of using. A more “modern” example of this comes from management consultant, the late Peter Drucker, “We now accept the fact that learning is a lifelong process…” So, if we know that we should keep “the little gray cells” active and that learning is important, what difference does it make whether that learning comes via training or development?