Cloud sourcing and cloud computing have become de-facto standards in recent years for a range of applications. Cloud solutions are attractive for a number of reasons including ease of use, pricing, availability, scalability, and reliability. In particular, small and medium enterprises (SMEs)...

Cloud computing is a paradigm for using IT services with characteristics such as flexible and scalable service usage, on-demand availability, and pay-as-you-go billing. Respective services are called cloud services and their nature usually motivates a differentiation in three layers:...