How often do you see business plans, cost/benefit analyses and project plan milestones that are fudged to make the right numbers? What does that tell you about the process? In planning for change what takes over is the plan.
How often do you see great plans with Gant charts, interdependencies identified, tasks allocated and scheduled for review and so on? Is all of this effort based in knowledge?
When plans go awry, people often think it is a failure of governance and project management, but is it?
Is Prince 2 the prince that has no clothes?