Answers to a series of commentaries are presented and the challenge Relational Frame Theory (RFT) presents to behavior analysis is explicated. RFT is a behavior analytic theory, based on extensive behavior analytic data, which appeals only to known principles to explain arbitrarily applicable relational responding. The claim that such responding is operant must be answerable within behavior analysis. RFT has too much empirical support for the field to avoid this challenge. If the answer is "yes," behavior analysis seems destined to enter a new era.
