It strongly depends on application domain. Jbpm "understands" mainly two process languages: jpdl and bpel. If your application concerns human activities jpdl is the right choice, otherwise if you are thinking about web-service orchestration, bpel is better. Anyway jbpm has recently changed in its architecture and now has got a central component named process virtual machine (PVM) on top of which you can build a process language specific layer to execute every kind of process definition. Paolo View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4216241#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...