The single biggest reason organizational changes fail is because no one has thought about endings or planned to manage their impact on people. Naturally concerned about the future, planners and implementers all too often forget that people have to let go of the present first. They forget that while the first task of change management is to understand the desired outcome and how to get there, the first task of transition management is to convince people to leave home. You’ll save yourself a lot of grief if you remember that.
William Bridges, Susan Bridges in Managing Transitions