This study evaluated the speed of acquisition and level of generalization of tacts across three different stimulus modes: picture-flashcard, video clip, and 3D object. Three young children diagnosed with autism participated in this study. The acquisition of tacts was evaluated during Discrete Trial Training sessions (DTT). Two of the three participants learned the tacts more rapidly in the video clip condition in contrast with the picture condition. All three participants generalized the three tacts learned through a specific stimulus mode to the remaining stimulus modes. One week after the generalization test, all participants generalized to all novel 3D objects.