Franklin Roosevelt actually said...

I can take two blueprints of exactly the same kind of organization, and those two blueprints won't look like each other at all.

I guess the answer is that they work it out together.

Well, I think all I can say is that I got an intimation of it several days ago, and that I am delighted that it is going so well.

I would say they all do mutually, and they are supposed to agree.