I need to create a rule with following requirements: There is a fact class called SystemInfo which contains idle information of a sytem public class SystemInfo { private double idle; //System idle percentage public void setIdle(double idle) { this.idle = idle; } public double getIdle() { return this.idle; } } The SystemInfo objects are continuously sent to DROOLS (StatelessSession) with 5 second delay. I need to create a rule rule "Start_New_Process_If_System_is_70%_Idle_Continuously_for_60_Seconds" when SystemInfo (idle >= 70) //Idle continuously for 60 seconds then // start new process end I need to fire this rule only if all the 12 SystemInfo objects which are sent with 5 seconds delay for 60 seconds, match the condition "idle >= 70". Even if a single SystemInfo doesn't match this condition then this rule shouldn't be fired. I am using DROOLS 4.0. Please help me in implementing the WHEN condition. Thanks -Ganesh -- View this message in context: http://www.nabble.com/Fire-rule-only-when-all-the-fact-objects-sent-durin... Sent from the drools - user mailing list archive at Nabble.com.