Adults with intellectual and developmental disabilities (IDD) may engage in challenging behavior. These behaviors present challenges to support staff who often lack training in effective behavior management procedures. Behavioral skills training (BST) is an empirically supported method of staff training and has been used to teach support staff a number of intervention skills. The purpose of this study was to extend the literature on BST and to examine the effects of BST on staff implementation of functional communication training (FCT) for three adults with IDD using a non-concurrent multiple baseline design. Results indicated that with BST, staff fidelity increased over baseline levels. With the addition of individualized coaching, staff implementation reached mastery criteria. Improvements in staff implementation fidelity corresponded with decreases in participant challenging behavior and increases in appropriate communication. Findings suggest that BST with coaching may be an effective method to train staff to implement FCT with adults.