As one of our fellow Yelp'ers pointed out to me recently, getting into the right pre-school is so important. We would agree!
We met JoDene Tryon, the founder of Mission Montessori several years ago when we moved to Scottsdale, since the school is located on our church, St Anthony on the Desert's property.
They believe, that it is their "mission to prepare and provide the most natural and life supporting environment for the child, observing the child and continually adapting the environment to support the fulfillment of the child's greatest potential--physically, intellectually, emotionally and spiritually." That's a nice summary of the Montessori method.
It's a great concept, and a great school. If you are new to the area, or are just looking for the right place for your three or four year old. I would make an appointment to see for yourself.