In the name of reform, Colorado Gov. Bill Owens has narrowed the evaluation of teachers to how their students perform on standardized tests. This simplistic approach ignores the complex, even cumbersome, nature of good teaching, and will make schools worse while destroying the passion that fuels good teaching, and draws good teachers.

http://epsl.asu.edu/epru/point_of_view_essays/cerai-00-13.htm