The three primary types of cloud computing services are Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS). IaaS delivers computer infrastructure including servers, storage and network. PaaS offers the computer platform as a service which facilitates development and deployment of applications. In SaaS, applications are hosted and maintained by a cloud provider and delivered to the users as services on demand. We have developed two patterns for cloud delivery services: IaaS and PaaS patterns. We develop here a pattern for Software-as-a-Service to complete all the three cloud service levels. These patterns will be used to study cloud security requirements.
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