Implementing Stochastically-Timed COWS for the Prism Probabilistic Model Checker

This thesispresents the implementationof theCOWS2Prism system, a compiler for stochastic COWS (Calculus for Orchestration of Web Services) into Prism. The process calculus COWS is intended to aid in the precise description of Web Services compositions. This places the present informal development approach associated with Web Services into a formal reasoning framework. The COWS calculus concerns itself with behavioural aspects although two timed extensions exist: Stochastic COWS and Timed COWS (for reasoning about non-functional aspects such as quality of service). In the dissertation we provide a syntax and a semantics for stochastic COWS, and then a detailed description of the design and implementation of the COWS2Prism system. We also give a well commented example of compilation of a COWS service into the Prism format.