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Process for System Architecture and Requirements Engineering by Derek Hatley, Peter Hruschka, Imtiaz Pirbhai

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Chapter 9. Modeling the Known Pieces

9.1. Overview

In this chapter, we build the pieces of the models that correspond to the requirements stated in Chapter 8. These pieces include the requirements context diagram, the system timing specification, the system entity model, and the architecture and requirements models for the Existing Sampling Module.

9.2. The Requirements Context

The requirements statements in Chapter 8 indicate that the central purpose of the system is to analyze groundwater, and that the external entities with which the system must interface are the operator, the specimen storage, the data processing center, and the toxic waste disposal. From these requirements, we can construct a context diagram, as shown in Figure 9.1.

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