The following quote comes from the Obama Administration’s education "blueprint," which is its plan for reauthorizing ESEA, placing a heavy emphasis, among many other things, on overhauling teacher human capital policies:
Of all the work that occurs at every level of our education system, the interaction between teacher and student is the primary determinant of student success.
Specific wordings vary, but if you follow education even casually, you hear some version of this argument with incredible frequency. In fact, most Americans are hearing it – I’d be surprised if many days pass when some approximation of it isn’t made in a newspaper, magazine, or high-traffic blog. It is the shorthand justification – the talking point, if you will – for the current efforts to base teachers’ hiring, firing, evaluation, and compensation on students’ test scores and other "performance” measures.