Introduces a method to model embedded dependability-critical systems as an AND-composition of guarded Statecharts, which are special UML Statecharts. With guarded Statecharts, we can model the reactive behaviour of embedded systems so that their quantitative analysis can be performed. First, we present our motivation for using guarded Statecharts to express the interaction between the hardware and software components of embedded systems and to model faults and errors as state perturbations. Then we discuss how these models are transformed into stochastic reward nets that are amenable to a quantitative dependability analysis. Finally, our approach is illustrated by an example.
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