Many SaaS companies with high ROI have addressed emerging trends through actions that drive cost reduction and leverage the adoption of the cloud for IT service providers. Leading IT suppliers of software and hardware services seeking to address the needs of their customers have thoroughly evaluated and adopted a cloud-style strategy. The challenges and issues must be expressed in a language that users understand: investment, cost reduction, and business performance. Return on Investment (ROI) is one of the most widely used measure of businesses’ success. If you want to use cloud computing rather than in-house IT, how will you assess it? What properties of cloud computing do affect ROI?