10.1 Dependability properties
All of us are familiar with the problem of computer system failure. For no obvious reason, our computers sometimes crash or go wrong in some way. Programs running on these computers may not operate as expected and occasionally may corrupt the data that is managed by the system. We have learned to live with these failures, but few of us completely trust the personal computers that we normally use.
The dependability of a computer system is a property of the system that reflects its trustworthiness. Trustworthiness here essentially means the degree of confidence a user has that the system will operate as they expect and that the system will not “fail” in normal use. It is not meaningful to express dependability numerically. ...
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