Software Design 2e - DIM

331The JSD processFigure 15.15 The JSD model at the end of the information function step (elaboration phase ofthe network stage).has been developed in terms of long-running model processes can be mapped onto aphysical system. It is therefore a physical design step, rather than ‘implementation’ inthe normal sense of writing program code.This phase is therefore concerned with determining, among other things, the formsthat may best be used to realize the components of the design model, such as statevectors and processes (in the latter case, some might be realized as physical processes,while others could become subprograms); and, in turn, how the physical processes areto be mapped onto one or more processors. This phase is also constrained by the decisionsabout scheduling that were made during the network phase, since these may helpto determine some of the choices about such features as hierarchy, and how this mayinfluence process scheduling.