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The Information Systems opening to the cloud computing has become a strategic choice for enterprises. In fact, the rapid evolution of competitiveness and innovation and the diversity of technologic offers incite IT decision makers to look for decision support tools helping them for the adoption of new solutions and services such as Cloud Computing. This article introduces a maturity assessment model of an information system architecture functional block that can be outsourced to the Cloud. Based on the best practices of enterprise architecture and information systems governance, the basic criteria of activities outsourcing, and the cloud computing adoption requirements, this model is built around four modules: the block scope identification, the outsourcing opportunity, the cloud computing architectural requirements, and governance and control. Thus, this model will provides new benefits for opened Enterprise Architectures to new technologies.

From Enterprise Architecture to Cloud Computing: A Decision-Support Model for Functional Block Outsourcing