The purpose of this study was to assess the impact of parent training on parent implementation of functional communication training (FCT) in the trained routine and in a novel routine. Three young children with developmental delays and their parents participated. A multiple-probe across parent-child dyads was used to evaluate the impact of parent training on parent fidelity of FCT. The data indicated that verbal and written instructions with performance feedback resulted in accurate implementation of FCT during the trained routine. The generalization assessment suggested that instructions and performance feedback promoted generalization for one parent and an additional training component was needed for another parent. The third parent did not complete the generalization assessment. The results suggest verbal and written instructions and performance feedback can lead to accurate implementation of FCT during the trained routine, but additional training components may be necessary to facilitate generalization to a novel routine.