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I read Toms' paper that described 40-40-20 it as "destructive goal pursuit" with which I wholeheartedly agree. However I also believe there is another even more destructive goal pursuit which underlies it that remains largely unrecognized. This is the never ending pursuit of the so called "achievement gap".The nations teachers have been on a fools errand for decades while poor and minority kids have been subjected to toxic amounts of remediation that ends up driving out more kids than it saves.It seems to me that everything hinges upon the question of whether or not it is possible to measure growth in human in terms of comparable numbers. I was formally trained as an educational evaluator and test developer and worked in the field for 5 years. I came away with the firm conviction that it cannot really be done.The numbers produced by any test are both crude and quirky. Most people don't realize that test numbers may not be multiplied or divided. There is no such thing as an average score for any sub group be it, a race, economic class, school or classroom of kids. If achievement tests are any kind of measurement instrument at all, which is debatable, then they are blunt instruments. The field of psycho-metrics rests upon a wobbly set of theories balanced atop some questionable assumptions. Never the less, there has evolved a multimillion dollar educational testing business fed by a publicly funded educational research infrastructure at work across the nation studying a problem they created in the first place when they first foisted the notion upon the public that they could actually measure growth in human learning with a degree of accuracy necessary for scientific analysis or for teacher pay.