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Structured Development for Real-Time Systems, Volume 2: Essential Modeling Techniques by Stephen J. Mellor, Paul T. Ward

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5 Completing the Essential Model – the Upper Levels

5.1 Introduction

The transformation and data schemas derived from the event list, while accurate representations of system requirements, are often unpresentable. For a reasonably complex system, both models consist of masses of interrelated details with no obvious large-scale organization. To facilitate presentation, the model will be repackaged from a “flat” form to a hierarchical form, using the notation for leveling described in Chapter 12 of Volume 1. In this chapter, we’ll concentrate on packaging the transformation schema, from which the data schema organization can be derived.

The leveling considered here is strictly upward leveling – the grouping of event responses and associated flows ...

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