I like the home-grown approach (ie: bottom-up instead of top-down) they've developed. The section "Five Easy Steps to a Balanced Math Program" gives a good overview of what the general goals of their math program area. It would be interesting to compare this to the guidelines in different states and countries. For example in California, the STAR guidelines are termed "blueprints" and available here: http://www.cde.ca.gov/ta/tg/sr/blueprints.asp Once we have a large table of the goals each district sets for their students it would be easy to tailor each math level.