MELY - Forrester applies an innovative approach toward measuring cloud computing market with company's analysts utilizing Forrester's sizing methodology for emerging markets to the cloud computing market for the first time, report co-author Stephen Reid wrote in a blog post. Reid admits that cloud computing definitions are still a serious challenge to researchers while "...each year, it gets harder to make clear-cut distinctions, based on technology, between what is a cloud and what is simply a virtualized data center or a traditional hosting provider. Therefore, Forrester decided to focus instead on the major disruption in the IT industry that cloud computing is bringing about — disruption based not on technology but on the business model under which IT operates."