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Teacher Rankings, Once Internal, Are Now Questioned - NYTimes.com
This New York Times article mentions that with one year of data that 35% of teachers are misranked and with three years of data that 25% of teachers are misranked. Therefore, I would say that if we lean heavily on the data that we will be incorrectly "dealing with" 25% of teachers -- ticking off good ones and making them leave and rewarding bad ones. We can do better than this administrators and school boards. Come on!
Teaching students with new tools, enthusiasm, and belief that teaching is a noble calling.