While getting ready to leave for the day I was reminded of a quote by Tom Peters, "Commitment, not authority produces results". All project stakeholders need to be committed to seeing that a project's objectives are met, but more importantly they need to be open, effective, and honest when it comes to their communications with the other team members and management.
To support the project team and ensure their success, management must provide the best people to participate on project teams, and have a deep seated belief that the people on the team are intelligent, creative, and have the capability to succeed.
The entire project team and all levels of management involved must have the attitude that they will do everything possible to ensure that the customer (end user) is satisfied with the product of the project.
The number one measure of project success is customer satisfaction. Having a set of "shared values" will help a project team increase customer satisfaction for every project they support.