Hi, I am new to Drools so please excuse me if this is a simple question. I currently have several rules that look as follows (one for each entry point): The intention of these rules is to average the speed, occupancy and flow of traffic at a particular road location over a 30 second sliding window. The rule works fine as it is, however it is not very scalable since I currently need a similiar rule and associated input stream for each road location that I am monitoring. There may be 100s of these. What I was really after was one rule that would perform the same averaging calculations over the 30 second window. My first thoughts were that I would need to lose the individuall input streams per location and thereby place all of the TrafficData facts from all locations into working memory. But then I was unsure how I would change the rule to group relevant TrafficData instances by their location (Note that the TrafficData instance has a location identifier within it) together before doing the averaging. Any assistance would be much appreciated. Regards, Steve -- View this message in context: http://drools.46999.n3.nabble.com/Drools-Accumulate-function-tp4023718.html Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users