A poorly made car, sofa, or meal can be easily returned or discarded.  A poorly educated child cannot; factory recalls are not an option in education.  There will never be a day when the evening newscaster announces, “Scottsdale High School issued a product recall on the graduating class of 2012.  If you currently employ a member of the class of ‘12, please return him or her to the district office for a class of ‘17 upgrade.
Oran Tkatchov Success for Every Student: A Guide to Teaching and Learning