Commands and CommandService are not necessary to give the user the capability of async commands. There is already an AsyncCommandService, but it should be hidden behind the other services. So I would translate your point into: There should be a way for users to obtain a synchronous and an asynchronous version of the ProcessEngine. E.g. by adding a method ProcessEngine getAsyncProcessEngine() on the process engine itself. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4236929#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...