Student achievement rises significantly when teachers regularly assign homework and students conscientiously do it.
Homework boosts achievement because the total time spent studying influences how much is learned.
Time is not the only ingredient of learning, but without it little can be achieved. Teachers, parents, and students determine how much, how useful, and how good the homework is. But high school seniors report they spend only 4 to 5 hours a week doing homework, and 10 percent say they do none at all or have none assigned. In contrast, students in Japan spend about twice as much time studying outside school as Ameri- can students. A Large-Sample Path Analysis.