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Top1. Introduction
Cloud Computing is transforming the way many organisations work and offers added values for operation management and service computing. Researchers have demonstrated the positive impacts it can offer for business engineering and service level management (Amburst et al., 2009; Brandic et al., 2009; Buyya et al., 2009). Amburst et al. (2009) identified cost reduction in IT services from using Cloud Computing. They also presented their Cloud Computing economics and ten major challenges for Cloud Computing. They emphasise a shift of risk from maintaining data centres and the capital costs of running them to the loss of data while managing Clouds. Buyya et al. (2009) assert that Cloud Computing offers billing-based Service Level Agreements (SLA) which can be used for operational management offering cost-savings and streamlining business activities and processes. In addition, Cloud Computing offers a variety of other benefits including agility, resource consolidation, business opportunities and green IT (Foster et al., 2008; Weinhart et al., 2009; Schubert, Jeffery, & Neidecker-Lutz, 2010; Chang, Li, De Roure, Wills, Walters, & Chee, 2011; Chang, Wills, & Walters, 2011; Chang, Wills, Walters, & Currie, 2011; Kagermann, 2011).
Computing Clouds are commonly classified into Public Clouds, Private Clouds and Hybrid Clouds (Ahronovitz et al., 2010; Boss et al., 2007; Sun Microsystems, 2009). The type of Cloud an organisation adopts will depend on its needs and the volumes and types of services and data they plan to have and use.