Abstract
Since more and more software exists, it is economically important to estimate whether or not operating experience gained with earlier software applications can be used in new applications. Normally new applications have another demand profile than the earlier applications had. For safety-related applications quantitative relationships are required. This contribution derives formulae that can be used to estimate the failure probability of the software in the new environment. In contrast to the work of other authors the present considerations are not based on software modules, but on execution paths. The related inaccuracies are taken into account. An example is given, as well as a method for getting and storing the path characteristics. The pre-requisites that have to be met in order to make the derived formulae applicable are mentioned.
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