Diane Ravitch wrote an Op-Ed piece on February 21, 2011 that appeas on CNN.com. She is a historian of education and the author of the best seller "The Death and Life of the Great American School System: How Testing and Choice Are Undermining Education."
http://www.cnn.com/2011/OPINION/02/20/ravitch.teachers.blamed/index.html?iref=NS1
http://www.cnn.com/2011/OPINION/02/20/ravitch.teachers.blamed/index.html?iref=NS1
