Because they are in charge of the planning, and different people
are in charge of the implementation of the plan. A good plan should
outline who does what-when and how success will be measured. In
Virginia, the comprehensive plan has to be updated every 5 years -
that is a time when you can see if the plan was implemented and why
it wasn't. Roanoke, Virginia does a comprehensive plan
implementation report every year to make sure the plan is being put
into action.