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The design is a commonly used English word that describes a variety of different human activities, depending on the context and the field of interest. In this book, the word “design” refers to a series of creative activities that are related to solving a problem identified in the customer domain to achieve a goal through synthesis. The identified problem is solved through synthesis. A set of functional requirements (FRs) is established in the functional domain through the mapping between the customer domain and the functional domain. The FRs are then satisfied by selecting design parameters (DPs) in the physical domain through the mapping between the functional and the physical domains. The selected DPs must satisfy the Independence Axiom, i.e., FRs at a given level of decomposition must not affect other FRs by the selected DP or be affected by other FRs. DPs are, in turn, satisfied by selecting process variables (PVs) in the process domain through the mapping between the physical domain and the process domain. Thus, the design consists of a series of transformation processes, beginning from the goal and the problems identified in the customer domain to FRs of the functional domain, FRs to DPs in the physical domain, and DPs to PVs in the process domain. In this design process, analysis often follows synthesis for the quantification of design decisions made. |
