I primarily use DTTC if the child is old enough. However, most of my caseload consists of preschoolers, many of whom, have limited attention skills. Although they can often imitate, getting them to attend to the face is a learning process. In this situation, I generally find what vowels, consonants and syllable shapes are within the child's repertoire and build on those. This, of course, is done within the context of play while utilizing the principles of motor learning and trying to maximize the number of productions in a session.