Message sequence chart
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The first version of the MSC standard was released in 1992.
Comparison to UML 
UML Sequence Diagram looks very similar to the ITU-T MSC but the default basic principles are quite different:
- In an MSC, the vertical lines are autonomous execution entities. They usually represent state machines executing in parallel. The state machines might not even be on the same machine.
- In a Sequence Diagram, a vertical line is usually an object. The object can be active (in its own thread of execution) or passive (in the execution context of an active object).
- In an MSC an arrow is usually an asynchronous message sent from one entity to another one. Once the message is sent the sending entity resumes its execution.
- In a Sequence Diagram an arrow is usually understood as an operation call on a class. It is therefore synchronous and the calling entity hangs until the operation returns.
Live Sequence Charts 
David Harel thinks that MSC still has several shortcomings such as:
- MSC propose a weak partial ordering semantics that makes it impossible to capture some behavioral requirements,
- The relationship between the MSC requirements and the executable specification is not clear.
- MSC Tracer Free tracing tool based on PragmaDev Real Time Developer Studio
- MscGen – Automatic generation of diagrams based on text descriptions of the messages.
- MscGenerator - Advanced version of MscGen, designed for telecom message flows.
- Web-based MSC Generator
- Msc2Svg – Generates charts as SVG from a simple text description file
- EventStudio – Message sequence chart generation tool
- LTSA – Supports the drawing and subsequent automated verification of message sequence charts.
- Sequence Chart Studio – Extends Microsoft Visio to draw and verify Z.120 compliant sequence charts.
- Trace2UML – Tool for drawing and recording sequence charts.
- MSC Latex package – a LaTeX package for creating message sequence charts.
- Online PCAP to MSC chart Generator – Generates MSC arrow diagram charts from PCAP files.
See also 
- "The history of MSC". sdl-forum.org. Retrieved 2009-09-19.
- "HMSC". sdl-forum.org. Retrieved 2009-09-19.
- Øystein Haugen. "MSC 2000". Ericsson. Retrieved 2009-09-19.
- "What is new in MSC 2000 relative to MSC 96.". sdl-forum.org. Retrieved 2009-09-19.
- Ekkart Rudolph, Jens Grabowski, Peter Graubmann (1999). "Towards a Harmonization of UML-Sequence Diagrams and MSC". University of Göttingen. Retrieved 2009-09-20.
- Øystein Haugen (June 2000). "UML 2.0 vs. SDL/MSC – Ericsson Position Statement". Ericsson. Retrieved 2009-09-19.
- David Harel (2003-04-08). "Message Sequence Charts". Retrieved 2009-09-20.
- David Harel (2005-02-22). "LSCs: Breathing Life into Message Sequence Charts". Formal Methods in System Design. Retrieved 2009-09-20.
- David Harel (2002). "Multiple instances and symbolic variables in executable sequence charts". Association for Computing Machinery. Retrieved 2009-09-20.
- ITU-T Recommendation Z.120 message sequence chart (MSC)
- Michel Reniers: “Message sequence charts – syntax and semantics”, PhD thesis, Eindhoven University of Technology, 1999
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