-> be no need for rework (which is often very expensive).  If
one -> teacher has a method that works better than the others
in use, then, -> IMO, everyone should be teaching that way.
To me, this is the crux of the problem. Neither teachers nor 
kids are programmable machines. Keep in mind that teaching is an 
art that hopefully includes scientific research as an 
underpinning. What is magic for a given teacher may never work 
for another.  
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