I was delighted when I read that Marzano's opinion of homework is that it is necessary to develop skills through practice. I have long been an advocate of homework, particularly on the high school level, much to the dismay of my own students. The fact that Marzano places importance on homework just helps me with my long-standing argument with parents, i.e. homework is an essential part of the learning process. In the foreign language classroom, students who do not practice at home are often lost in class the next day. As I tell parents, the homework is practice for the tests and quizzes and helps the students to know what they still need to ask. Those who do not do homework regularly have a lower grade and little chance of passing a class in which practice is not a suggestion, but a requirement. According to Marzano, a good"rule of thumb" for homework is ten minutes per grade level. The homework for my class should typically take about 15-20 minutes, so I do not feel that is burdensome for high school students. How much homework is too much? Is there such a thing as too much homework? Is the student capable of determining when he/she has achieved mastery and should then be able to quit practicing? One difficulty that I have seen on the high school level is the number of students who copy their homework from their peers, thus learning nothing from the practice, and earning low scores on quizzes and tests as a result. I do wish there were a way to limit this common practice!