In system engineering, a system milestone review conducted when the definition effort has proceeded to the point where system requirements and the design approach are defined. Alternative design approaches and corresponding test requirements have been considered and the developer has defined and selected the required equipment, logistic support, personnel, procedural data, and facilities. This normally is late in the definition phase. This review is conducted in sufficient detail to ensure a technical understanding between the system developer and the customer. The system segments are identified in the system design specification, and the hardware/software configuration items are identified in the requirements specifications.