Hi guys, While trying to understand how slinding window work, I realize that all exemples are given with "accumulate" or "collect" functions , I din't know why ?? *$a : List() from collect(Event1() over window:time(2s) from entry-point "point") * // work Bur why *$a : Event1() over window:time(2s) from entry-point "point") * doesn't work ??! Thanks, Youssef AZBAKH -- View this message in context: http://drools.46999.n3.nabble.com/Problem-with-events-in-thr-futurs-with-... Sent from the Drools: User forum mailing list archive at Nabble.com.