If a matter only affects a and b then the common facilitator group would be involved to find a solution:
This structure forms the basis of the accountability system between ourselves which each of us must actively participate in failing which human nature is to blame others for our problems. It also is foundational as all members will have a clear understanding of what is expected from each and how we will be judged, and hence our aims are high - to uphold the truth in all our affairs to these same high standards, and to ensure others do the same.
