上游充通大 e SHANGHAI JIAO TONG UNIVERSITY When are Specification Established? Concept Syetem-Level Detall Testing and Productlon Development Ramp-Up System Spec Critical Design Production Approval Revlew Revlew Review Approval Mission Develppment Statement Identify Establish Generate Select Test Set Plan Plan Customer Target Product Product Product Final Downstream Needs Specifications Concepts Concept(s) Concept(s) Specifications Development Perform Economic Analysis Benchmark Competitive Products Build and Test Models and PrototypesWhen are Specification Established?