Three children who displayed destructive behavior maintained by negative reinforcement received functional communication training (FCT). During FCT, the children were required to complete a demand and then to mand (touch a card attached to a microswitch, sign, or vocalize) to receive brief play breaks. Prior to and 1 to 3 times following the initiation of FCT, extinction probes were conducted to evaluate the resurgence of destructive behavior when the microswitch without the mand card was present or the microswitch and the mand card were absent to determine if different patterns of resurgence occurred when the microswitch was present or absent and, for 2 of the children, if changes in resurgence occurred at different points in treatment. Results showed that FCT led to relatively rapid reductions in destructive behavior. During all extinction sessions, resurgence of destructive behavior occurred with only minimal differences across the switch/no card and no-switch conditions. (Contains 5 figures.)