The present document provides a description of the content of TIPHON Release 4 and shows the relevant documents and their inter-relationships.

Each TIPHON release builds upon and extends the previous release. In this manner Release N contains and extends Release N-1, and is itself extended by Release N+1.

The present document is structured as follows:

• clause 4 introduces the release plan documentation set;
• clause 5 defines the content and capabilities of TIPHON Release 4.

The present document does not provide solutions for the technical issues that are identified therein.

The present document is prepared in accordance with the TIPHON project method defined in TR 101 835 [1] and fulfils the requirements of Step A.

In addition, the present document contains a comprehensive overview and description of the technical aspects of TIPHON Release 4.