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Relational Frame Theory (RFT) is a behavioral account of human language and cognition that emerged primarily from converging lines of research on rule-governed behavior and derived stimulus relations. It is an extension of B.F. Skinner’s analysis of verbal behavior in some respects, but also directly challenges some of the basic tenets of that analysis. More importantly, it has drastic implications for how we conduct a science of human behavior, as it explains how stimulus functions can be altered in ways that are not directly predictable from a traditional contingency analysis. RFT provides a framework for an analysis of complex human behavior, and serves as the basis of promising new interventions in applied behavior analysis (e.g., PEAK Relational Training System) and clinical psychology (e.g., Acceptance and Commitment Therapy). This tutorial, first published in 2004, helps the learner master the key concepts, terms, and approach of RFT.