A computer system for controlling calls to a call target, including a processor in communication with non-volatile memory, the non-volatile memory executing code including code for receiving call target information relating to the call target, code for accessing a database and retrieving a contact rate for a time period for the call target, code for placing a call target identifier in a queue indicating the call target will be called during the time period, when the time period has a contact rate greater than a threshold rate, code for placing a call to the call target during the time period, and code for updating the contact rate based on an outcome of the call.