Willow Creek has a new book out that is sure to change your church, at least according to the video. While not 100% sold on how to measure spiritual growth of someone else, Willow Creek has definitely had some influential ideas in the past that have obviously worked, I mean look at the size of their churches! :) Seriously though, you should check this resource out if this sort of thing interests you. I am sure a lot of churches will be using this terminology before the end of this year.
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In Move, you'll discover that it is possible to measure spiritual growth, why you can't always rely on "numbers," and the four, simple and reproducible practices common to all churches effectively moving their people toward Christ-centered living.