Systematic reinforcement techniques applied in a home setting controlled the performance of household tasks by 2 children. Experiment I showed a decrease in completion time for a series of 10 tasks when correct performance was reinforced. In Experiment II introduction of a limited-hold criterion reduced variability in completion time and slightly reduced completion time itself. An extinction phase produced both an increase in time to complete tasks and in refusals to begin tasks. In Experiment III the introduction of new reinforcers appeared to have a positive effect on reinforcement behavior. In Experiment IV established task performance by one child was disrupted by introduction of a second child reinforced for the same tasks.