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Structured Development for Real-Time Systems by Paul T. Ward, Stephen J. Mellor

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Chapter 6. Modeling System Services — Process Management

Introduction

Many embedded systems have suffered from inflexibility. Accommodating a change in user requirements, or re-implementation in a new hardware or software environment, requires such extensive changes in these systems that they must be rebuilt from scratch. A major cause of inflexibility is failure to separate the portions of a system that implement the application from the portions that provide the support environment. The inflexibility of many early real-time systems was inevitable because of the limitations of the available processor hardware; maintainability can take precedence over operational efficiency only when there is sufficient capacity available. However, we have argued ...

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