At a recent New York State Association of Independent Schools (NYSAIS) trustee workshop, Independent School Management (ISM) consultant Terry Moore advised that a school's mission statement should be no more than 30 words. He cited The Julliard School's mission as an example ". . . provide the highest caliber of artistic education for gifted musicians, dancers, and actors from around the world, so that they may achieve their fullest potential as artists, leaders, and global citizens."
In any case, if your school is thinking about its mission statement, it would be helpful to pick up a copy of the Fall 2009 issue of Independent School magazine. The theme of this issue is mission, mantras, and meaning. Peter Gow's article "Missions, Mantras, and Meaning" is excellent.