Analisis Estructurado Moderno Spanish by Edward Yourdon

By Edward Yourdon

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1. 1. The process is initiated at the top left of the Vee with the definition of the operational need of the stakeholders. The focus of the decomposition and definition process (or design) is the movement from an operational need to system-level requirements to specifications for each component to the specifications (or specs) for each CI. 3, parallel work on high- and low-level design activities is not only permitted but also encouraged. The iterative nature of this design process, from high-level issues such as stakeholders' requirements to low-level issues such as component and CI design, is accomplished by moving vertically in the Vee over short increments of time.

To be successful, the engineering design of systems must embrace the notion that many decisions are made during the development process. This is not a controversial position to take. However, adopting the notion that these decisions should be made via a rational, explicit process is not consistent with much of the current practice in the engineering of systems. 3 lists a sample of the many categories of development decisions. Chapter 14 provides a method for addressing these decisions. An important philosophical point in decision making is that decisions have to be made with the best information available at the time, realizing that the outcomes associated with the decision remain uncertain when the decision is made.

As part of design, the integration and qualification plans are developed. The purpose of qualification is the verification and validation of the system's design. Verification addresses the following question: Does the component, element, segment, or system meet its requirements, or have we built the component,…, system right? On the other hand, validation, which is often combined with acceptance testing, demonstrates that the system satisfies the users' needs, or have we built the right system?

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