An Introduction to TTCN-3

The third edition of TTCN (Tree and Tabular Combined Notation) will be a complete redesign of the entire test specification language. The close relation between graphical and textual representation will be removed, OSI specific language constructs will be cleared away and new concepts will be introduced. The intention of this redesign is to modernize TTCN and to widen its application area beyond pure OSI conformance testing. This paper motivates the need for a new TTCN, explains the design principles and describes the status of the work on the third edition of TTCN.