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Verification techniques like model checking, preorder checking and equivalence checking are shown to be relevant to web service orchestration. The Concurrency Workbench of the New Century (CWB) is a verification tool that supports these verification techniques. By means of the Process Algebra Compiler (PAC), the CWB is modified to support the BPE-calculus. The BPE-calculus is a small language, based on BPEL4WS, to express web service orchestration. Both the syntax and the semantics of thedoi:10.1145/1022494.1022526 fatcat:nycz2wm5jjgavhfedaub7wqf7q