Abstract
It is a common practice that safety-critical software systems are extensively verified and validated before their deployment. However, even the most advanced verification methods are not capable of removing all faults from the system. Moreover, in many cases the safe operation of the system depends on a set of (sometimes implicit) design assumptions related to its target environment. If such an assumption is violated (due to unpredictability of the environment), it may result in a hazardous situation. To deal with the above problem the safety monitoring principle can be adopted while designing safety critical applications. The paper presents an approach to systematic synthesis of a safety monitor device. The approach is based on object oriented modelling of the application followed by identification of possible scenarios leading to a hazardous situation. The scenarios are then used to synthesise a safety monitor an automaton which is capable to detect that a hazardous scenario is developing in the system.
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