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The recent upward trend in adopting cloud computing by businesses worldwide reflects the captivating opportunity of cost effective computing brought by cloud computing to replace the traditional IT computing services model. However, the decision to adopt cloud computing is somewhat complex. This paper will review the literature of cloud computing service and deployment models with the aim to determine the relevant characteristics of both service delivery and deployment models. Then, the authors will develop a mapping between the two sets of characteristics of cloud computing models. The mapping will lead to the development of a decision-making framework for managing cloud-computing adoption.