4This paper extends the Tiger, Hanley, and Bruzek (2008) review of functional communication training (FCT) by reviewing the published literature on reinforcement schedule thinning following FCT. As noted by Tiger et al. and others, schedule thinning may be necessary when the newly acquired communication response occurs excessively, to the extent that reinforcing it consistently is not practical in the natural environment. We provide a review of this literature including a discussion of each of the more commonly used schedule arrangements used for this purpose, outcomes obtained, a description of methods for progressing toward the terminal schedule, and a description of supplemental treatment components aimed at maintaining low levels of problem behavior during schedule thinning. Recommendations for schedule thinning are then provided. Finally, conceptual issues related to the reemergence of problem behavior during schedule thinning and areas for future research are discussed. Keywords: alternative activities, delay-to-reinforcement, demand fading, functional communication training, multiple schedules, punishment, response restriction schedule thinning ABSTRACT F 1 Articles were initially located by reviewing published studies listed in the PsychLit and PubMed databases between January 1985 to October 2009. Two search terms, one from each category, were always combined and each term was combined with every other term in the other category. The terms were as follows: (1) functional communication training; (2) functional communication; and (3) alternative communication. Following this initial step, the abstracts of the articles meeting the above criteria were reviewed to determine if the authors had implemented FCT as a treatment for aggression, self-injury, or property destruction (referred to in this manuscript collectively as "problem behavior").