I'm not quite sure howDrools processes and partitions Agenda based on agenda-groups as the documentation conflicts with a real example. As per the documentation in Drools site and Michael Bali's book, page 102 "Drools maintains a stack of Agenda groups. Whenever the focus is set to true, the active agenda-group is automatically changed to rule's agenda group. Drools maintains a stack of agenda groups. Whenever the focus is set to a different group, Drools adds this group to a stack. When there are no rules to fire from the agenda group, Drools pops from the stack and sets the agenda group to the next one." However, when I run a simple example with two rules having agenda groups set, none of the rules are fired unless the agenda-group is explicitly set to runtime. Based on the above example, I would expect Drools Agenda to run all rules under "MAIN" and since there are none, it should pop it out and point to the next available group and so on. Am I missing something here? package com.sample import com.sample.DroolsTest.Message; rule "Hello World" agenda-group "group1" # comment this and rule fires when m : Message( status == Message.HELLO, myMessage : message ) then System.out.println( myMessage ); m.setMessage( "Goodbye cruel world" ); m.setStatus( Message.GOODBYE ); update( m ); end rule "GoodBye" agenda-group "group 2" # comment this and rule fires when Message( status == Message.GOODBYE, myMessage : message ) then System.out.println( myMessage ); end DroolsTest:- KnowledgeBase kbase = readKnowledgeBase(); StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); Message message = new Message(); message.setMessage("Hello World"); message.setStatus(Message.HELLO); ksession.insert(message); // ksession.getAgenda().getAgendaGroup("group1").setFocus(); // enable this only group1 is fired, not // group2 ksession.fireAllRules(); -- View this message in context: http://n3.nabble.com/Understanding-agenda-group-doesn-t-work-as-documente... Sent from the Drools - User mailing list archive at Nabble.com.