As shown in Figure 12.1, the place of the engineering design phase in the systems engineering life cycle follows the advanced development phase and precedes the inte-gration and evaluation phases. Its inputs from the advanced development phase are seen to be system design specifications and a validated development model of the system. Other inputs, not shown, include applicable commercial components and parts, and the design tools and test facilities that will be employed during this phase. Its outputs to the integration and evaluation phase are detailed test and evaluation plans and a com-plete set of fully engineered and tested components. Program management planning documents, such as the work breakdown structure (WBS) and the systems engineering management plan (SEMP), as well as the test and evaluation master plan (TEMP), or their equivalents, are utilized and updated in this process. Figure 12.2 shows that the integration and evaluation phase usually begins well before the end of engineering design to accommodate test planning, test equipment design, and related activities.