Combining a proprietary panel of more than 50,000 senior IT buyers with our robust data-collection methodologies, 451 Research's The Voice of the Enterprise: Cloud Transformation Vendor Evaluations survey tracks and analyzes the disruption occurring in the market today and exposes the major opportunities for enterprises, IT vendors, suppliers and investors. The study represents more than 700 completes of a web-based survey, completed by IT and cloud decision-makers worldwide, primarily based in North America and Europe, and supplemented by 20 in-depth, phone-based interviews. The sample is representative of small, medium, large and very large organizations in both the private and public sectors. In addition to regular quarterly topics, the survey focuses on the suppliers of cloud computing infrastructure products and services, including on-premises private cloud computing infrastructure products/platforms and IaaS/public cloud services. This includes the 451 Research Vendor Window, which plots enterprise adoption as well as Promise and Fulfillment indices that compare vendors' effectiveness at both marketing and execution.