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Lehrerleistung ist nicht an der Schülerleistung zu bemessen ...

„Student achievement is the product of many factors, most of which teachers have little or no control over, such as students’ home and family contexts, their health and other personal factors, their other prior and current teachers, and school resources ranging from books, class size, and curriculum, to the availability of reading specialists. Indeed, researchers have found that teachers account for only about 7-10 % of the variance in student learning.“

Univ.-Prof. Dr. Linda Darling-Hammond u. a., „Teaching in the Flat World“ (2015), S. 22