Bob Eccles has published a post at Forbes.com entitled: The Statement Of Purpose And What You Need To Do. He sees this as a simple way to ensure that a focus on long-term success gets the attention it deserves:  

The time has come to put this idea into practice. Our proposition is a simple one. The board of a company should publish an annual one-to-two page “Statement of Purpose” that clearly articulates the company’s purpose to profitably achieve a solution for society. It specifies within that purpose the few stakeholders most critical to long-term value creation and sustainability. While many, if not most, companies have mission and vision statements, almost none of them are signed by the board of directors. 

Read more