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In book subjects a student can only do a student's work. All that can be measured is how well he learns, rather than how well he performs. All he can show is promise.

Peter F. Drucker (2011). “Landmarks of Tomorrow: A Report on the New”, p.144, Transaction Publishers
In book subjects a student can only do a student's work. All that can be measured is how well he learns, rather than how well he performs. All he can show is promise.