I recommend this very measured report from the Center for American Progress on what to do with and how to identify ineffective teachers. Nowhere does it mention sending teachers back to school for elaborate retraining and pointless credentialing, or other handouts dressed as reforms, nor does it deny the usefulness of standardized testing. They outline a set of broad guidelines and policies that should be adopted at the federal, state, district, and school level. This strikes me as a serious attempt to define a broad and moderate outline for addressing a serious problem, that if adopted has the potential to result in a fair and effective process for removing bad teachers.