From the article, The Myth About Homework - Think hours of slogging are helping your child make the grade? Think again by CLAUDIA WALLIS, Time/CNN.
• According to a 2004 national survey of 2,900 American children conducted by the University of Michigan, the amount of time spent on homework is up 51% since 1981.
• Most of that increase reflects bigger loads for little kids. An academic study found that whereas students ages 6 to 8 did an average of 52 min. of homework a week in 1981, they were toiling 128 min. weekly by 1997. And that's before No Child Left Behind kicked in. An admittedly less scientific poll of parents conducted this year for AOL and the Associated Press found that elementary school students were averaging 78 min. a night.
• The onslaught comes despite the fact that an exhaustive review by the nation's top homework scholar, Duke University's Harris Cooper, concluded that homework does not measurably improve academic achievement for kids in grade school. That's right: all the sweat and tears do not make Johnny a better reader or mathematician.
• Too much homework brings diminishing returns. Cooper's analysis of dozens of studies found that kids who do some homework in middle and high school score somewhat better on standardized tests, but doing more than 60 to 90 min. a night in middle school and more than 2 hr. in high school is associated with, gulp, lower scores.
• Teachers in many of the nations that outperform the U.S. on student achievement tests--such as Japan, Denmark and the Czech Republic--tend to assign less homework than American teachers, but instructors in low-scoring countries like Greece, Thailand and Iran tend to pile it on.
Success on standardized tests is, of course, only one measure of learning--and only one purported goal of homework. Educators, including Cooper, tend to defend homework by saying it builds study habits, self-discipline and time-management skills. But there's also evidence that homework sours kids' attitudes toward school. "It's one thing to say we are wasting kids' time and straining parent-kid relationships," Kohn told me, "but what's unforgivable is if homework is damaging our kids' interest in learning, undermining their curiosity."