The Washington schools chancellor, Michelle A. Rhee, dismiss 25 teachers after evaluated on the qualification what the teachers have. How good is one teacher compared with another?

When school districts increased it assumed a system called value-added modeling to find the solution to the question and problems, aggravating battles from Washington to Los Angeles . Some people said that this method is the most effective one which could enhance teacher liability. However there are some refused that it may show the fake of teacher’s work.

Those who examine the statistics, making a few statistical assumptions could create the rank of teachers best to worst.

In Los Angeles 6,000 around 6000 elementary school teachers understand themselves under inspection this summer after The Los Angeles Times published a series of articles on their performance, together with database research through its website from least effective to most effective.

Edward Haertel, a Stanford professor who was a co-author of the report said that if those teachers were evaluated differently the result would be similar.

One research stated that they require to all the grade three students to take the exam at the end of the school year to estimate how much school they will at for grade four.

If the student got higher than 60 scores in grade three, they estimated that the student will get even more than 60 scores for grade four.