Those in urgent need of this feature can get it from the trunk. Documentation isn't there yet, but the test should give you a pretty good idea of what it does: http://svn.boost.org/svn/boost/trunk/libs/statechart/test/TriggeringEventTes... As always, feedback is highly welcome. Regards, -- Andreas Huber When replying by private email, please remove the words spam and trap from the address shown in the header.