The best way to learn is to teach. Assisting is a positive part of a resume or curriculum vita. Not enough money for graduate lab assistants. Completion of the course in which the laboratory is offered, or of an equivalent course, and permission of instructor. Students re-learn materials by explaining to other students.
Students learn to deal with other people.
Students learn to prepare quizzes, grade papers and quizzes and give brief instructions under a professor s direction. Assessment of participation, of quizzes and grading done, and of usefulness of student to others. Thus, any subsequent course makes this course possible.