1. Any organized assembly of resources and procedures united and regulated by interaction or interdependence to accomplish a set of specific functions. 2. A combination of two or more interrelated equipment (sets) arranged in a functional package to perform an operational function or to satisfy a requirement. 3. A collection of personnel, equipment, and methods organized to accomplish a set of specific functions. 4. See: Electronic Information Processing System (EIP System. ) 5. A specific ITSEC installation, with a particular purpose and operational environment.