It is useful at this point to give some illustrations

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Unformatted text preview: g some of these key structures. Structures that describe the product system include, but are not limited to, the requirements tree, system architecture, and certain symbolic information such as system drawings, schematics, and databases. The structures that describe the producing system include the project's work breakdown, schedules, cost accounts, and organization. These structures provide different perspectives on their common raison d'etre: the desired product system. Creating a fundamental harmony among these structures is essential for successful systems engineering and project management; this harmony needs to be established in some cases by one-to-one correspondence between two structures, and in other cases, by traceable links across several structures. It is useful, at this point, to give some illustrations of this key principle. System requirements serve two purposes in the systems engineering process: first, they represent a hierarchical description of the buyer's desired product system as understood by the product development team (PDT). The interaction between the buyer and system engineer to develop these requirements is one way the "voice of the buyer" is heard. Determining the right requirements— that is, only those that the informed buyer is willing to pay for—is an important part of the system engineer's job. Second, system requirements also communicate to the design engineers what to design and build (or code). As these requirements are allocated, they become inexorably linked to the system architecture and product breakdown, which consists of the hierarchy of system, segments, elements, subsystems, etc. (See the sidebar on system terminology on page 3.) The Work Breakdown Structure (WBS) is also a tree-like structure that contains the pieces of work necessary to complete the project. Each task in the WBS should be traceable to one or more of the system requirements. Schedules, which are structured as networks, describe the time-phased activities that result in the product system in the WBS. The cost...
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