The growing burden of homework is disconcerting. Equally important, however, is what the research doesn’t show: namely, that homework is necessary or beneficial. We know all about the stress and exhaustion, the family conflict and loss of time for other activities. (“Our kids are missing out on their childhoods,” one Mom laments.) But we reassure ourselves that it’s all worth it because homework raises achievement, teaches independence and good work habits, helps them to become more successful learners.