Cost model for software as a service

The SaaS model is software delivery model that allow the end user to use the software online without it being installed on their computer. The end user is charged by the service provider for using the services. Most of the existing Cloud cost models determine usage-charges based on infrastructure cost. In this paper, the cost model for the SaaS services is proposed that focuses not only on infrastructure but also on service parameters. The proposed model considers the service parameter for the SaaS such as customization, configurability, portability, security, QoS parameters including performance, usability, response timeliness, scalability and reliability, interoperability, data isolation and application isolation. With the help of proposed model, the service provider is able to calculate the efforts in developing the service more accurately and provide better service package deals to the service consumer.