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Queueing network models have achieved a prominent place in the modelling of computer system performance. Recent formulations of operational methods by Buzen and others have greatly facilitated their practical use. On the other hand, Kolence's software physics has addressed the problem of appropriate metrics for both performance and capacity of processors and systems and for the workloads with which they interact. This paper integrates the methods of operational queueing network analysis into an extension of software physics. A significant feature of this approach is that parameters of the equipment and of the workload are not confounded in the analysis but are kept distinct, finally combining in the model computations proper. The objectives, principles and assumptions are stated and the basic quantities are defined. The fundamental operational laws and certain of the algorithms are derived and illustrated with examples. (Author)