A Practical Guide to SysML by S. Friedenthal, et. al.

By S. Friedenthal, et. al.

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What Is the Progress of the Design and Development Effort? Model-based metrics can be defined to assess design progress by establishing completion criteria for the design. The quality attributes in the previous section refer to whether the model is complete relative to the defined scope of the modeling effort. This is necessary, but not sufficient, to assess design completeness. The requirements satisfaction described to measure design quality can also be used to assess design completeness. Other metrics may include the number of use case scenarios that have been completed or the percent of logical components that have been allocated to physical components.

For example, a method may impose a constraint that logical components can only be allocated to hardware, software, or operational procedures. These constraints can be expressed in the object constraint language (OCL) [33] and enforced by the modeling tool. Enforcing constraints assists in maintaining consistency across the model, but it does not prevent design inconsistencies. A simple example may be that two modelers inadvertently give the same component two different names that are interpreted by a model checker as different components.

Analysis is performed to understand the needs of each stakeholder, and define relevant effectiveness measures with target values. The target values are used to bound the solution space, to evaluate the alternatives, and to discriminate the solution from competitor solutions. In this example, the effectiveness measures may relate to the primary goal for addressing the transportation needs such as performance, comfort, fuel economy, range between refills or recharge, safety, reliability, repair time, purchase cost, environmental impact, and other important but difficult to quantify measures such as aesthetic qualities.

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