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Abstract
This thesis addresses the reusability of SaaS applications in Cloud Computing (CC) and proposes a Service Oriented Architecture (SOA) based approach to improve cloud computing reusability by providing an understandable customization model together with a technique to validate customizations made by tenants. It has been shown that the current SOA-Based approaches used to improve the reusability of SaaS applications in Cloud Computing don{u2019}t provide SaaS application developer with a simple and understandable reusable and customizable model. This leads SaaS application developer to: a strict model that can{u2019}t be customized easily to meet each tenant{u2019}s unique requirements, and can{u2019}t be stored in a database to be reused in the future