You just use the old classes when writing a 5.X application, and the new ones when writing a 6.X app. -- View this message in context: http://drools.46999.n3.nabble.com/Query-regarding-Upgrade-to-drools-API-6-1-0-tp4030736p4030738.html Sent from the Drools: User forum mailing list archive at Nabble.com.