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Although cloud computing is emerging as a main delivery vehicle for IT services, there is much confusion about what it is and how it works. This session brings clarity by examining the facts and common knowledge of IT and builds an essential body of knowledge about cloud computing with three easy-to-remember numbers. The discussion includes definitions of cloud computing, where the opportunities are, and how IT professionals can play an enabling role in transforming an existing IT establishment into a cloud-friendly, cloud-ready environment. We review the architecture and examine the service delivery models of cloud computing while we step through business scenarios and the operations of employing public cloud and private cloud.