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Udacity Reevaluates Online Education
As Thrun was being praised by Friedman, and pretty much everyone else, for having attracted a stunning number of students–1.6 million to date–he was obsessing over a data point that was rarely mentioned in the breathless accounts about the power of new forms of free online education: the shockingly low number of students who actually finish the classes, which is fewer than 10%. Not all of those people received a passing grade, either, meaning that for every 100 pupils who enrolled in a free course, something like five actually learned the topic. If this was an education revolution, it was a disturbingly uneven one.
‘An Industry of Mediocrity’
The first step is to make teacher colleges much more selective. According to one respected study, only 23 percent of American teachers — and only 14 percent in high-poverty schools — come from the top third of college graduates.
Good teachers have a surprisingly big impact on their pupils’ future income
The common practice of “tracking” pupils (filtering good ones into more advanced courses) could be to blame, the authors reckon, though they abstain from drawing firm conclusions. Whatever the cause, getting more effective teachers to instruct better-performing pupils naturally exacerbates the gap in achievement. Making the best teachers work with the worst pupils could go a long way toward minimising the yawning differences in attainment within a school system, the authors contend.
.. Effects seem to be stronger for girls than for boys, and English teachers have a longer-lasting influence on their pupils’ futures than maths teachers.
.. The authors reckon that swapping a teacher at the bottom of the value-added spectrum with one of average quality raises the collective lifetime income of each class they teach by $1.4m. That rise would apply across all the teacher’s classes and over the whole of his or her career.