Figure 1: The Cloud service layers (adapted from Grossman, 2009; Lin et al., 2009 and Weinhardt et al., 2009) The three Cloud services of Cloud Computing are related. They can be consumed as separate services or can be combined. I.e. PaaS can be installed on IaaS (Lederman etal., 2008; Lin etal., 2009). This relationship is visually represented in Figure 1. In a public Cloud, organizations use Cloud Computing technologies through a CSP. The Cloud is physically located outside the premises of the organization. The Cloud is fully outsourced to the CSP, leaving the organization with little direct control over the hardware (Grossman, 2009). Public Clouds are typically offered through virtualization and distributed among various physical machines. Often multiple Clouds are hosted on the same hardware.
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