In a recent blog, "Make No Small Plans," I proposed a system innovators could use to create very effective schoolwide programs.  I defined these as programs capable of making a difference in student achievement large enough to bring entire schools serving disadvantaged students to the levels typical of middle class schools.  On average, that would mean creating school models that could routinely add an effect size of +0.50 for entire disadvantaged schools.  +0.50, or half a standard deviation, is roughly the average difference between students who qualify for free lunch and those who do not, between African American and White students, and between Hispanic and non-Hispanic White students.