you can try this and let me know global List globalIdList #psedo rule rule "check global lsit" when foo: Foo() // you don't need to declare like this--list : List() from globalIdList eval(globalIdList.contains(foo.getId())) then //do something end -- View this message in context: http://www.nabble.com/lhs-%22contains%22-check-using-global-list-tp209293... Sent from the drools - user mailing list archive at Nabble.com.