Hi Drools, I'm not completely sure about choosing Listener from which package either from drools-core or kie-api. I do see Listeners are available as below in kie-api and drools-core api. kie-api org.kie.api.event.rule AgendaEventListener.java RuleRuntimeEventListener.java WorkingMemoryEventListener.java kie-api org.kie.api.event.rule.process ProcessEventListener.java drools-core org.drools.core.event AgendaEventListener WorkingMemoryEventListener RuleBaseEventListener KieSession accepts listener from kie-api. In which we can configure drools-core listeners? What Listeners are preferred to use? Please share your thoughts. Thanks, Shrinath.