We spent some time trying to figure out why our activation-group functionality was not working. Activation groups are supposed to cause only a single rule to fire within the same group. What we were experiencing is that all the rules were firing, essentially ignoring the activation-group setting. We have determined that it is because we were setting an option on the KnowledgeBaseConfiguration of Sequential.Yes. If we comment out that line activation-groups work. I don't know enough to know if this is by design or if it is a bug. I searched the documentation and the drools-user Nabble forum and could not find an answer to this issue. I wanted to at least post this information so that if anyone else has this problem they don't have to go through the same struggle we had. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Activation-group-does... Sent from the Drools - User mailing list archive at Nabble.com.