CHAPTER 2 Dependability Requirements
Learning objectives of this chapter are to understand:
• The basic terminology of dependability.
• The overall importance of dependability requirements and how to state them.
• The relationship between systems and software dependability.
• The principle of As Low As is Reasonably Practicable.
2.1 Why We Need Dependability Requirements
The computer systems with which we are concerned provide a service, and, as we have seen, failure of that service can have a variety of serious consequences. When considering the development of a new system, the fundamental engineering that we undertake is determined considerably by the need to avoid failure.
Setting out to build a system that “does not fail” is ...
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