actor actually relates to what we now call an IdentityRef: a reference to a user or a group (this is now typed: UserRef and GroupRef inherit from IdentityRef) basically the participant is a generalization of the pooled actors in jbpm 3. pooled actors were candidates. now we have other forms of participantion as well: candidate, owner, viewer, client, and so on. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4210944#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...