[caption id="attachment_70955" align="alignleft" width="225" caption="The "Overall Level of Effort" approach might provide a model for traditional schools to follow—and it suggests that one size need not fit all when it comes to student-teacher ratios."][/caption]

What number of students should each teacher teach? How many is “too many”?

As a lifelong passionate fan of the teaching profession, I used to believe these questions had a pretty simple answer: The fewer the better. Throughout the class-size debates of the past 15 years, which have led to limits in the range of 20 students per...

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