UML nowadays, has emerged as the industry standard for object-oriented modeling. However, it still lacks a well-defined semantic base enabling it to perform formal verification and validation tasks. Our goal being to provide system designers a life cycle of software development integrating conviviality and rigor, we propose a methodology to specify, verify and validate using UML. This methodology is based on a technique which derives colored Petri nets from UML class, statechart and collaboration diagrams. The approach that we propose associates the formalization of the object dynamics to the formalization of the object behavior. A case study is provided to illustrate this technique.
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