Volume 38, Numbers 3 and 4, Spring 2017 The Place of Ordinary Psychological Categories in Behavior Analysis Filipe Lazzeri This paper discusses the place of ordinary psychological categories (OPCs) — i.e., terms from “folk psychology” (e.g., “intention,” “fear,” “thinking”) — in a science of behavior, especially in behavior analysis. Based upon Laudan’s problem-solving metA–Theoretical framework,