"Mission Statements" and "Vision Statements" do two distinctly different jobs.

A Mission Statement defines the organization's purpose and primary objectives. Its prime function is internal – to define the key measure or measures of the organization's success – and its prime audience is the leadership team and stockholders.

Vision Statements also define the organizations purpose, but this time they do so in terms of the organization's values rather than bottom line measures (values are guiding beliefs about how things should be done.) The vision statement communicates both the purpose and values of the organization. For employees, it gives direction about how they are expected to behave and inspires them to give their best. Shared with customers, it shapes customers' understanding of why they should work with the organization.
http://www.mindtools.com/pages/article/newLDR_90.htm

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Note added at 36 mins (2011-12-22 20:26:28 GMT)
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PS: Een visietekst gaat per definitie op zoek naar een veelomvattende kijk op het thema. In een visie wor-den de bakens uitgezet die richtinggevend en inspirerend zijn voor het handelen. Deze bakens worden aangeleverd door een veelheid van belanghebbenden en betrokkenen:
http://www.clbmechelen.be/Documenten/Visietekst llnbegeleidi...