Through constant exposure to adult input in interaction, children's language gradually develops into rich linguistic constructions containing multiple cross-modal elements subtly used together for communicative functions. Sensorimotor schemas provide the "grounding" of language in experience and lead to children's access to the symbolic function. With the emergence of vocal or signed productions, gestures do not disappear but remain functional and diversify in form and function as children become skilled adult multimodal conversationalists. This volume examines the role of gesture over...