Parents and their children with severe expressive impairments may have limited successful communicative exchanges due to each partner's difficulty in recognizing and responding to communicative behaviors of the other. This study examined the communicative functions and modes of communication that received contingent responses in 20 dyads of parents and young children with severe expressive impairments. Parents responded more often to children's nonvocal behaviors and adult-directed behaviors than vocal behaviors and non-adult-directed behaviors (i.e., child gestures or vocal behaviors that were not conveyed toward the direction of the adult). The children responded more often to parent communication about goal-directed than non-goal-directed tasks. Implications of these results for communication intervention are discussed. (Contains 4 tables.)