Holding teachers 100% accountable when they account for 10% of student test score variance
To hold teachers 100% responsible when they can account for only “10 percent of the variability in student test scores” is insane, especially in light of the fact that other factors such as “family income and education levels” account for 90% of the variability.
Jim Shimabukuro via http://etcjournal.com/2012/01/28/student-failure-teacher-failure
