Everything as a Service (XaaS) on the Cloud: Origins, Current and Future Trends

For several years now, scientists have been proposing numerous models for defining anything 'as a service (aaS)', including discussions of products, processes, data & information management, and security as a service. In this paper, based on a thorough literature survey, we investigate the vast stream of the state of the art in Everything as a Service (XaaS). We then use this investigation to explore an integrated view of XaaS that will help propose approaches for migrating applications to the cloud and exposing them as services.