A business case is the best method for making a strategic decision to invest in cloud services, as it provides a structured and comprehensive analysis of the costs, benefits, risks, and value proposition of the proposed investment. A business case can help justify the need for cloudservices, compare different options and alternatives, and align the investment with the enterprise’s strategy and objectives. A request for information (RFI) is a document that solicits information from potential vendors or suppliers, but it does not provide a decision-making framework. Benchmarking is a process of comparing the performance or practices of an enterprise with those of others, but it does not evaluate the feasibility or desirability of cloud services. A balanced scorecard is a tool that measures and monitors the performance of an enterprise or a business unit against strategic goals and objectives, but it does not assess the viability or suitability of cloud services. References: : CGEIT Review Manual (Digital Version), Chapter 3: Benefits Realization, Section 3.2: IT Investment Management, Subsection 3.2.1: IT Investment Management Overview, Page 97 : CGEIT Review Manual (Digital Version), Chapter 3: Benefits Realization, Section 3.2: IT Investment Management, Subsection 3.2.4: IT Investment Management Process, Page 104 : How to Write a Business Case: Template & Examples1