There's no perfect system to measure teacher performance, but if we want to be wedded to public school, we must find a way to reward those who deliver the goods and to weed out those that do not.
"A growing number of school districts have adopted a system called value-added modeling to answer that question, provoking battles from Washington to Los Angeles — with some saying it is an effective method for increasing teacher accountability, and others arguing that it can give an inaccurate picture of teachers’ work.
The system calculates the value teachers add to their students’ achievement, based on changes in test scores from year to year and how the students perform compared with others in their grade.
People who analyze the data, making a few statistical assumptions, can produce a list ranking teachers from best to worst."
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