Blaž Parkelj (2012) Analysis and Comparison of Application and Business Models for Software as a Service. EngD thesis.
The thesis deals with one of three cloud computing service models – software as a service. Software as a service is an application delivery model and includes architectural aspects for application implementation and business model, which is quite different than traditional application business model. After short introduction we placed subject into wide area of computer science. We defined the concept of software as a service, its main characteristics and basic terms that are used throughout the thesis. We mentioned maturity model and two simple SaaS application classifications. We presented SaaS software model, which includes multitenant model, access control, integration, composite architecture, metadata services, monitoring and measuring. We described SaaS business model, its main characteristics and changes inside enterprises that come with embracing SaaS model. Furthermore we described service level agreement and its characteristics. SaaS has big influence both for service providers and service customers. We described effects on IT and presented TCO analysis, which is used to determine total cost of application ownership. Service customer can decide whether to purchase an application on outcome of TCO analysis. At the end we developed sample multitenant application.
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