Suppose that an engineer is presented with a device whose functioning he does not understand, and suppose that through experiment he can obtain information about input-output relations of this device. He would not hesitate, if rational, to construct a theory of the internal states of the device and to test it against further evidence. ... By objecting, a priori, to this research strategy, Skinner merely condemns his strange variety of “behavioral science” to continued ineptitude. - Noam Chomsky