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An introduction to the ITU standard language Message Sequence Chart (MSC) is provided. It is pointed out that MSC in many respects is complementary to the ITU specii-cation and design language SDL. MSC in combination with SDL or other languages, now plays a role in nearly all stages of the system development process. Since MSC has been standardized in the(More)
Sequence Diagrams as part of UML play an important role within use case driven object oriented (OO) software engineering. They can be seen as OO variants of the ITU-T standard language Message Sequence Chart (MSC) which is very popular mainly in the telecommunication area. Both notations would beneet from a harmonization. A more formal and powerful notation(More)
MSC is a trace language which in its graphical form admits a particularly intuitive representation of system runs in distributed systems while focusing on the message interchange between communicating entities and their environment. For the rst time the MSC recommendation Z.120 MSC'92 was approved at the ITU meeting Geneva 1992. A new revised MSC(More)
The development of an MSC based graphical representation of TTCN is part of the ETSI project STF 156 on 'Specification of a Message Sequence Chart/UML format, including validation for TTCN-3'. The most important language constructs of TTCN can be translated into corresponding MSC constructs in a straightforward manner. However, it turns out that without(More)
Recently, the European Telecommunications Standards Institute (ETSI) approved the third edition of the Tree and Tabular Combined Notation (TTCN-3) as a requirement to modernise and widen its application beyond pure OSI conformance testing. As part of this evolution, TTCN is embracing Message Sequence Charts (MSCs) as a natural notation for specifying and(More)