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The Ravenscar tasking profile for Ada 95 has been designed to allow implementation of highly safety critical systems in Ada. Ravenscar defines a tasking run-time system with deterministic behaviour and low complexity. We provide a formal model of the primitives provided by Ravenscar including exceptions. This formal model can be used to verify safety properties of applications targeting a Ravenscarcompliant run-time system. As an illustration of this, we model a sample application using alldoi:10.1109/rtcsa.1999.811307 dblp:conf/rtcsa/LundqvistA99 fatcat:aa2ujfcmpfe6xakri5g27gxrky