For example, while many charter schools have shown great results with children of all ages--the KIPP (http://www.kipp.org) academies are a shining example of the potential available for new teaching techniques and highly trained, devoted staff--the KIPP foundation and most charter schools have proven it difficult to scale in a cost effective manner (though commenter John at http://www.eduwonk.com/2009/02/kipped-3.html claims that KIPP can scale). Certainly, putting higher-paid and better-trained staff in controlled environments with students whose parents are motivated can improve the prospects of the children educated there.
But how can these ideas be replicated inexpensively? Part of the answer is technology--more distributed, effective online learning. Part of the answer is administration--better school and school system management. And part of the answer is more parental involvement--the schools can't parent and teach.