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Charts: Lots More "Excellent" Teachers Under New Chicago System?

Looking at the green areas on the Chicago Sun-Times graph below it certainly looks like there are lots more excellent teachers now than in the past (as well as more unsatisfactory teachers in red):

ScreenHunter_04 Sep. 19 09.55

However, a closer look (and a helpful explanation from Sun-Times reporter Lauren Fitzgerald) reveals that the results of the new evaluation system are shown in the second bar from the right, which reveals somewhat fewer excellent teachers and lots more developing ones.  

The bar on the far right is, I'm told, the distribution of ratings for tenured teachers circa 2010-2011, some but not all of whose work has been evaluated using the new system starting last year. 

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here's the corrected / clarified version of the sun times chart

http://ht.ly/p3o1r

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