System life cycle Phase 5 1.104 Definition: System life cycle Phase 5, the system test and integration phase: When the physical components of the system have been produced, the system test and integration phase begins, wherein systems engineering supervises and coordinates integration of the physical components into a system whose physical components will work together to satisfy the customer’s operational need. Then systems engineering uses the system REALITY (see 1.83) to test the real system and document the
