The 74 Million

“No man is an island.” “The whole is greater than the sum of its parts.”

In some ways these truisms don’t seem to apply to the prevailing notion of schools. Policymakers from President Obama on down have focused on the individual teacher as the locus for improvement. "[The] single most important factor in the classroom is the quality of the person standing at the front of the classroom," President Obama has said, echoing many researchers and policymakers...