Hi Tihomir, I realized that my question was wrong. Here it is the right question; Why does drools's latest package (5.2) contain jBPM Eclipse Plugin (http://www.jboss.org/jbpm/components/eclipse-plugin ) instead of BPMN2 Eclipse editor (http://kverlaen.blogspot.com/2011/02/new-bpmn-20-eclipse-editor.html)? Is there any problem or issue with BPMN2 Eclipse editor? Does BPMN2 Eclipse editor offer the same functionality for Debugging and testing as jBPM Eclipse Plugin? Which Eclipse Plugin do you suggest when testing your processes in Eclipse? jBPM Eclipse Plugin or BPMN2 Eclipse editor? Thanks Orhun YILMAZ