Educational Research Single-Subject Critique Establishing Discriminative Control of Responding Using Functional and Alternative Reinforcers During Functional Communication Training Wayne W. Fisher, David E. Kuhn, and Rachel H. Thompson Appropriateness of research question or purpose: The purpose of this research was interesting and of value as it focused on problems that often occur when Functional Communication Training (FCT) is in use. This study sought to find effective solutions as desired “. . .response[s] may be weakened and destructive behavior[s] may reemerge . . .” when reinforcements of communication are delayed