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ABSTRACT
A History of the Behavioral Therapies (O'Donohue, Henderson, Hayes, Fisher, & Hayes, 2001), as Paul (this issue) points out, contains no description of psychological behaviorism (PB) and the role it played as one of the foundations of behavior therapy. This article indicates (1) some of the contributions made by PB that make the missing chapter and related phenomena a major aberration in science, as well as (2) that this aberration seems due to inter-theory rivalry, and (3) that inter-theory rivalry is a general phenomenon and damaging both to behavior therapy (BT) specifically and behaviorism generally.