The experiment reported herein was conducted to determine whether interresponse-time (IRT) shaping can produce different response rates in 2 components of a multiple schedule that are equated with respect to reinforcement rate. To this end, pigeons' key pecks were reinforced with food, if they terminated IRTs that were more extreme (shorter in 1 component and longer in the other) than 20 of the most recent 24 IRTs, and an average of 30 s had elapsed since the previous reinforcement. Large intercomponent differences in response rate occurred in all of the subjects, even though the intercomponent differences in reinforcement rate were negligible. The relevance of the present findings to prior research on IRT shaping is discussed.