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BPEL is a standard language for Web services composition. To test a composite Web service, the design of a formal model is very useful, because it facilitates the application and the automatization of test generation methods. In this paper, we propose a transformation procedure of the BPEL specification into an Intermediate Format (IF) model that is based on timed automata. This IF format is well adapted to model BPEL (timed) constructs and to handle faults, events, termination, message correlation and activities synchronization. The proposed transformation was implemented in the BPEL2IF tool, which is also presented in this paper.