“…In fact, there may be somewhat of a theoretical divide between some behavior analysts and their approaches to language and cognition (e.g., see a recent discussion, Dymond & Alonso-Á lvarez, 2010;Schlinger, 2008). Indeed, there are those who have extended Skinner's analysis (S. C. Hayes et al, 2001), those who seem to adhere closely to it (e.g., Palmer, 2004Palmer, , 2008Schlinger, 2008), and those who integrate multiple perspectives (e.g., Barnes-Holmes, BarnesHolmes, & Cullinan, 2000;Greer & Speckman, 2009;Rehfeldt & Root, 2005;Rosales & Rehfeldt, 2007). As RFT has gained popularity with both researchers and practitioners in behavior analysis (e.g., Dymond, May, Munnelly, & Hoon, 2010;Rehfeldt & BarnesHolmes, 2009), advocates of Skinner's approach have begun to respond to the critiques of Skinner's definition made by RFT theorists.…”