One interesting point about Head Start--a potential weakness is that it is all kids who are poor. A new study came out on a brand-new public pre-K program in Boston that is not means-tested--pre-K for all regardless of income. Good results. One thought is that the mixed-income environment may be helpful to the poorer kids.

http://vitals.nbcnews.com/_news/201...-poor-and-affluent-kids-study-finds?lite