Part IV Parameterization
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چکیده
In Parts II and III we have discussed extensively the dehnition and evaluation of queueing network models. Here, in Part IV, we discuss the parameterization of these models. Parameterization is the heart of the modelling process, for the results of a study can be no more accurate than the parameter values provided to the queueing network evaluation algorithms. Our presentation is divided into three parts. In Chapter 12 we discuss the construction of baseline models of existing systems. A validated baseline model is the starting point for any performance study of an existing system. In Chapter 13 we discuss modijcation analysis: the process of adjusting parameter values to project performance for modified environments. The key to modification analysis is the ability to anticipate and represent primary effects. For this reason, modification analysis relies on the experience of the analyst to a significant extent.
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