Andrew, Just a comment on your first question of OS and other formats. First, there is no real way to control what happens, so we have to let it be. If it works, fine, if not the participants will send a loud message by not engaging in it. Second, I believe there is a benefit in combining other formats into an OS experience, and vis-a-versa. To me, part of the overall plan is to have open space become a way of life and not an event. As a labor union - management organization, we use the Roger Fisher "Seven Elements - Conflict Resolution" process, however, we try also to create an open space environment in which to do it. It works well for us.
Dave Koehler Peoria Area Labor Management Council Peoria, Illinois USA