Maybe Teach for America isn't so effective after all?

Ok, so they don't say TFA isn't effective, but they do say that TFA's uncertified teachers are not making a big difference compared to other uncertified teachers. This one is definitely worth reading. Report: http://schoolredesign.net/srn/binaries/teachercert.pdf Info on report: http://schoolredesign.net/srn/news/certification.html
(Read the author's response to TFA.) Found in ASCD PD Smartbrief.