Teacher evaluation is arguably the hottest issue in education right now. Because of Race to the Top, many states and districts around the country are designing and implementing new teacher evaluation systems that--for the first time ever--evaluate teachers based on how much their students learn. However, there is limited research on how to build an evaluation system centered on classroom observations that can distinguish between effective and ineffective teaching. This report from the University of Chicago Consortium on School Research focuses on Chicago, but the lessons learned have...