Hi All, Thanks for all the help so far I could not have gotten this far this fast without it. I have a couple questions regarding windows, accumulate and CEP. * Is this a valid rule: $param : Parameter(name == "testParam") $uEvent : ParameterUpdateEvent(name == $param.name, $value : value) over window:length(5) from entry-point "EPOne" The above rule compiles and runs but the issue is I see: OBJECT RETRACTED value:ie.pk.SystemsManagement.Alerting.ParameterUpdateEvent@19ea173 factId: 6 After inserting each event, I would think the length window would fill up before any are retracted. * Is there anyway to tell if a window is full, I don't want to hit the consequence if the window is not yet full. * Is there a way to name windows, my use case is as follows: o Drools application is reading updates from an ActiveMQ bus and turning them into ParamUpdateEvents and inserting each event into EPOne o Each of these parameter updates contains one param value, so I could get an update for param1 then an update for param2... o Is it possible to have one rule which would sum the last 5 values of param1 and sum the last 5 values of param2. I can only get it to sum the last 5 updates without regard for wich param it is I hope this somewhat clear. Thanks for you help. Glenn