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Published online by Cambridge University Press: 10 October 2000
It is suggested that the control-system theory of Domjan et al. restates in engineering vocabulary the primary thesis of law-of-effect theories: namely, that classical-conditioning arrangements may involve CR-contingent reinforcement. The research cited by Domjan et al. is relevant to the idea that classical conditioning is an adaptive process, but is irrelevant to their control-system theory.