Organizations can outsource information systems (IS) at various scales, from a small percentage of services to the entire range of services that they need. in which an organization decides to separate the IS-related tasks and outsource them to another organization to produce, based on a defined contract. Several factors affect the organization’s decision to outsource. After the decision to outsource is taken, an organization must decide on the type of outsourcing model to follow. There are various outsourcing models and frameworks and each of them focus on specific dimensions like strategic, capability, resources, financial, relationship, organizational structure, institutional arrangements, knowledge, management, security, computability, function characteristics and performance. Also, there are some challenges/ limitations in the existing outsourcing models and frameworks like a restriction to specific outsourcing environments, determining performance outcomes, risks and organization issues, knowledge integration and lack of factors that needed to be added in each outsourcing model to improve the performance of the model. There is no outsourcing model/ framework that decides which of these dimensions should be included. The aim of this paper is to present a comparative study of the existing outsourcing models and frameworks. The results of this study lead to insights into their capabilities, dimensions, factors, advantages, and limitations for building an enhanced and integrated outsourcing model.