1: no, yes 2: yes 3: yes 4: by using the api startpoint: reading docs (e.g. getting started), looking at examples, searching the forum, wiki, e.g. with google etc.. On a more serious note, you should do a little more R (and then D) before asking these basic questions. You see you get basic answers then. But interestingly, without this info you already made a choice although they are fundamental issues btw, it is jBPM-JPDL View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4182505#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...