Ss. Cyril and Methodius University in Skopje
There are different perceptions of the term Cloud Computing Interoperability (CCI) defined by different points of views. The CCI is a hot research topic and has been addressed by many scientists, architects, groups etc. A lot of different approaches and possible solutions are published, but there is no accepted standard or model yet. This paper is a survey of the most influential published CCI models and discusses their possibilities and challenges. This paper is set to analysis of the Software as a Service (SaaS) CCI model based on adapters.