VAM (Value Added Modeling)

I have alot of respect for the work that David Cohen does over at InterACT, a policy oriented group named the "Accomplished Teachers of California."   He recently made the virtual journey to the Answer Sheet- a blog by Valerie Struass at the Post, in which he argues against the use of Value Added measurement tools in California.   And while I respect him, if it has not already become clear, I could not disagree with him more on the use of VAM.    I recently came across a policy report from NYC that I found both interesting and readable.   I'm not sure it has been peer reviewed but it has a lengthy but readable discussion on the pitfalls and potential uses of VAM.   It's a good starting place for those who want to learn more.