Something that's really hard to deal with is the untyped CommandService interface. It's not obvious what gets returned, there's a lot of casting involved and sometimes the result is ambiguous. Bernd, what do you think about a typed interface opposed to 'public Object execute(Command command)' ? Could you picture a more fine grained interface? I think it would make it much easier to read and understand. Furthermore it would help to distinguish different API versions of the command facade, when JBPM evolves. You know we could deprecate and extend much easier. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4125009#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...