Mission Domain. Customer needs and requirements are determined, and effectiveness is assessed in the Mission Domain. Initial inputs to this domain are the MNS, POE, threat definition and mission scenarios. Customer requirements (CRs) are the output. In this research, CRs are specified in three ways: 1) required operational capabilities (ROCs); 2) performance constraints, goals and thresholds; and 3) an overall mission measure of effectiveness (OMOE) index which defines mission effectiveness as a function of ship MOPs. The definition of a quantitative relationship between mission effectiveness and ship performance in the mission domain is an essential prerequisite to a disciplined search of design parameters in the physical domain. Modeling, simulation and expert opinion are used to define the OMOE as a function of MOPs. Some MOPs are binary, the ship has a capability or it doesn't. Others are continuous, such as sustained speed or endurance.