Service Oriented Architectures and service-centric models arose in the last years as a standard de-facto in IT enterprises for offering practically any kind of services to users world-wide. In particular Cloud-based models provide means for realizing and distributing, including infrastructures, hardware and software platforms and services. Even if at the moment Service-centric models and technologies are mature in the IT scenario, composition, analysis and validation of Cloud services are open research challenges. In this work we describe a methodology based on Multi-Agent Models which allows for description, composition and verification of requirements of Cloud-based services. The methodology uses a modeling profile able to describe services as agents in a multi-agent environment and it is based on Model Driven Engineering (MDE) techniques. The proposed methodology includes a verification process for requirements that exploits formal methods during the whole life cycle of services.
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