The change in system materialization status during the engineering design phase is schematically shown in Table 12.1. It is seen that the actions “visualize,” “define,” and “validate” in previous phases are replaced by the more decisive terms “design,” “make,” and “test,” representing implementation decisions rather than tentative proposals. This is characteristic of the fact that in this phase, the conceptual and developmental results of the previous phases finally come together in a unified and detailed system design.