Hi there, I can't seem to find a hint in the documentary about WHEN an event is considered to be recognized by a sliding time window. I tried it out myself with an event with a duration of 5000 (= 5s) and a rule with a sliding time window of just 1s. So the event can never be completely situated in the window, only the end or start time can be. As it turns out, the rule fires once as soon as the event is inserted. Personally, I don't like this behaviour. But why isn't this documented somehow? Kind regards Oliver -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Sliding-time-windows-... Sent from the Drools - User mailing list archive at Nabble.com.