This document contains the computer program performance specification CPPS for the system controller (SC) unit which is part of Integrated Electronic Warfare System (IEWS). This system is described with emphasis on the relation between the SC and various units. Functional descriptions of all SC computer operations are provided which include all input, processing, and output requirements. The SC computer program shall provide IEWS with the capability to evaluate emitter signal parameters which have been characterized by the signal sorter, assess the threat situation and initiate appropriate defensive responses. In addition, this computer program shall monitor the status of several system units and supply control signals to adapt to various operating conditions. The computer program shall also supply various data for display and instrumentation purposes. The executive shall control the real time operation of the computer program. It shall schedule the execution of overlapping programs, handle all input/output operations, monitor program execution and take corrective action as required to maintain acceptable program execution.