Defining the Cloud Computing Framework

As cloud computing emerges there is a lot of discussion about how to define cloud computing as a computing model. Maturity models have been published and debated, and providers clearly have a model for their own products. In attempting to define this better to the clients, author of this paper came up with a "stack" of sorts, which I think makes logical sense, considering each component of cloud computing and how they interact. While clearly this could be much more complex, I don't think it needs to be. In essence, this is a model as to how one defines and refines the concept of cloud computing.