I must understand the context within which you have made your commitment. Defend the scope of commitments. As your leader, I cannot change the scope of your commitment without re-negotiating with you. I must be prepared to explain the scope of your commitment to anyone who does not understand it. Ensure satisfaction of dependencies.
Most commitments depend on other commitments.
As your leader, I must support you in holding others accountable for their commitments to you. Manage to objectives. If you are accountable to me for achieving an objective, I must not interfere with your progress, nor place constraints on your methods which violate your assumptions. Demonstrate faith in the team. If you know that I am depending on you to do your best, that I trust your word, and that I haven't made alternative plans, you will understand the true value of your commitment to me.