Homework has been shown to improve student GPA. It serves four main functions: 1) pre-learning to introduce topics, 2) checking understanding, 3) practice of skills, and 4) processing concepts. For homework to be effective, it should be differentiated, involve minimal parental involvement, include feedback but not grading, follow an established policy, and have homework support programs. Homework time should be designated and parents should facilitate homework without doing it for students.