Walking today through Somerville, Massachusetts's Winter Hill Community School during school hours differs markedly compared to just a few years ago. Gone are the greasy potato chips and chocolate-chip cookies from the a la carte offerings in the cafeteria. Missing are the late morning fundraisers when children would fill up on cupcakes and other…

Professor Hill Walker has identified three challenges to handling disruptive student behavior: prevention, at-risk programs, and high-intensity interventions. Principals should beware administrative traps: getting tough is enough, targeting a few difficult students, seeking quick fixes, finding one powerful trick, revering outside experts, and…