Do you review your daughter’s homework every night? Robinson and Harris’s data, published in The Broken Compass: Parental Involvement With Children’s Education, show that this won’t help her score higher on standardized tests. Once kids enter middle school, parental help with homework can actually bring test scores down, an effect Robinson says could be caused by the fact that many parents may have forgotten, or never truly understood, the material their children learn in school.

Similarly, students whose parents frequently meet with teachers and principals don’t seem to improve faster than academically comparable peers whose parents are less present at school. Other essentially useless parenting interventions: observing a kid’s class; helping a teenager choose high-school courses; and, especially, disciplinary measures such as punishing kids for getting bad grades or instituting strict rules about when and how homework gets done. This kind of meddling could leave children more anxious than enthusiastic about school, Robinson speculates. “Ask them ‘Do you want to see me volunteering more? Going to school social functions? Is it helpful if I help you with homework?’ ” he told me. “We think about informing parents and schools what they need to do, but too often we leave the child out of the conversation.”…

While Robinson and Harris largely disproved that assumption, they did find a handful of habits that make a difference, such as reading aloud to young kids (fewer than half of whom are read to daily) and talking with teenagers about college plans. But these interventions don’t take place at school or in the presence of teachers, where policy makers exert the most influence—they take place at home.

What’s more, although conventional wisdom holds that poor children do badly in school because their parents don’t care about education, the opposite is true.