Spin trail to a Message Sequence Chart conversion tool

This paper presents the Spin trail to a Message Sequence Chart conversion tool (st2msc) that was developed as an auxiliary tool to a well-known Spin model checker. If the model of the system does not satisfy the specified requirement, Spin outputs the trail that demonstrates the exact execution path of the system, leading to wrong behaviour. The Spin trail is usually very long and, thus, very difficult to explore. The st2msc tool converts the Spin trail into a more readable MSC diagram adjusted to an engineer´s needs. Therefore, debugging of the execution trail is significantly lightened. We demonstrate the power of the tool on a real-life implementation of the ISDN User Adaptation protocol. The first results are very promising and give us many ideas for further improvements.