This Special Issue consists of commentaries on ontology and epistemological controversies in CBS. Printer-friendly version Perspectives on the nature of being, becoming and reality from contextual behavioral science Beyond What “Is” and What “Is-Not” Breaking the ontology taboo: Reply to Monestès and Villatte Contextualism, psychological science, and the question of ontology The Functional Contextual a-ontological stance and Bas C. van Fraassen’s Constructive Empiricism The language of ontology is the subject matter of behavioral science Book traversal links for Special Issue on Ontological and epistemological controversies in contextual behavioral science; Edited by Louise Hayes Using conceptual developments in RFT to direct case formulation and clinical intervention: Two case summaries Up Perspectives on the nature of being, becoming and reality from contextual behavioral science