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Verification, Validation, and Testing of Engineered Systems by Avner Engel

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6.2 VVT COST AND RISK MODELING

6.2.1 Canonical VVT Cost Modeling

The CVM paradigm is introduced in order to capture the qualitative and quantitative implications of performing a system’s VVT process. A CVM is a conceptual, almost philosophical entity with unique individual components for each industry, product and sometimes project. This model of the VVT process entails definition of a collection of VVT activities together with their costs and times where each activity is associated with a system’s lifecycle phase.

The VVT activities are linked together defining a sequence of VVT tasks. In order to simplify the problem of modeling the system VVT process, we assume here a sequential process. From a feedback perspective, this model is simplistic, as it assumes a linear progression of the VVT process. Loops and feedbacks are left for future research. A CVM is defined as a complete set of activities and associated costs and time parameters designed to verify, validate and test a system throughout its lifecycle. It is worth noting that the CVM is an idealized concept. It is not likely to be carried out in practical applications in its all-inclusive form, since it would require excessive financial and time resources. Many industrial and governmental organizations perform about 15–25% of CVM and, in special circumstances (e.g., spaced manned missions), perhaps 25–50% of CVM is performed. The intent here is to create a yardstick for evaluating selected (partial) sets of activities with ...

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