okay. I am not a big fan of mutex, so best is I redesign it as described. Thanks very much for your answers! itchupe -- View this message in context: http://drools.46999.n3.nabble.com/MUTEX-mutual-exclusion-in-Drools-tp3117430p3117624.html Sent from the Drools: User forum mailing list archive at Nabble.com.