you can create two rule... rule "or_conjunction_one" when eventA : EventA(status == true) from entry-point "StreamA" then System.out.println("A"); end rule "or_conjunction_two" when eventB : EventB(status == true) from entry-point "StreamB" then System.out.println("B"); end ----- with kind regards, -- View this message in context: http://drools.46999.n3.nabble.com/How-to-use-OR-Operator-tp3197784p319811... Sent from the Drools: User forum mailing list archive at Nabble.com.