A reinforcement procedure used to teach the response class "do as I do." The procedure involves reinforcement for correspondence between modelled performance and an imitative operant. The contingency requires the observer to perform the same action as the model. Reinforcement increases imitative behavior, while extinction makes it decrease. If a child is reinforced with praise for imitation of nonsense syllables by a puppet, this response will increase. When praise is withheld, imitation of the puppet declines.