[Susan notes: What's to comment? Walt Gardner's letters are omnipresent and quite wonderful.]
To the editor
Naomi Riley's argument for merit pay for teachers does not stand up to scrutiny (SCAN, March). The only way to assess the validity of her claim is to design a rigorous study with experimental and control groups. The schools in each group need to be similar in terms of prior achievement, poverty level, demographics, and method of assignment.
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