If we accept Irving Wladawsky-Berger early insight on cloud computing as the evolution of Internet based computing, it is clear that not a single but multiple technologies are at work facilitating network access to a pool of configurable computing resources (NIST). That hardware decoupled virtualized shared resource pool is highly available, provisioned and released on demand (NIST) with a high degree of provider automation so as to minimize management overhead. Revision 15 of NIST lists not a single but three styles or models of delivering services via cloud computing. The first, software as a service (SaaS) provider applications are accessible from end user heterogeneous computing devices; second, platform as a service (PaaS) provides an homogeneous environment suitable for the end user deployed/managed applications; and third, infrastructure as a service (IaaS) suitable for end user arbitrary deployment and control of applications and platform, storage, and processing. It should be noted that in those styles or service delivery models aforementioned, the complexity of underlying cloud infrastructure is hidden from the end user. Hence, cloud computing is rather an methodology delineating an evolving computing paradigm having characteristics of high availability and broadband, elasticity, pooling of resources and a mechanism to measure the usage of those (NIST). Accordingly, although cloud computing may be logically categorized into private, public, community, and hybrid deployment models, Irving Wladawsky-Berger might describe the evolving paradigm as analogous to the industrialization of the delivery mechanism for cloud services: the datacenter.