After each iteration, project managers discuss bottlenecks, identify waste and develop a plan to eliminate it.
1st iteration:
Project Manager A: Requiring approval of multiple Project Managers for the same thing is causing a bottleneck. So is having to wait for a specific manager for a specific topic.
Resolution: Let all managers approve everything and need only a single manager’s approval.
2nd iteration:
Project Manager B: There are too many redundant managers. It’s a waste of resources.
Resolution: Get rid of all mangers but one. Actually, let the engineers manage themselves.