How to Write Your Mission Statement

While consulting with a client today I suggested that they might want to include a mission statement as part of their home page especially since they're a newly established firm. I found three articles that approach creating one and they're all worth reading:

From Entrepreneur, lengthy but informational
http://www.entrepreneur.com/management/leadership/businessstrategies/article65230.html

From wikiHow, a more succinct, step-by-step approach
http://www.wikihow.com/Write-a-Mission-Statement

and finally, from FastCompany, a more candid commentary but one definitely worth reading:
http://www.fastcompany.com/magazine/140/do-something-wordplay.html