Document the project vision, and make it part of meetings, presentations, project reviews, and reporting. Keep the vision visible using signs, websites, and other methods.
Frequently remind team members and stakeholders of the vision, and use it in informal communications. Show enthusiasm for the vision and reinforce it until people see it as inevitable. Projects do not succeed because they are easy; they succeed because people care about them.
Use the vision to overcome barriers, to manage change, and to support decision making. Align rewards and recognition with the vision.