All students are expected to attend class. However, the important consideration is that the student have a firm mastery of the subject. This mastery may be demonstrated in several ways - participation in class discussions is one; high grades on homework, laboratory assignments, and tests are others. Attendance in class and recitation sessions is mandatory for students who have not shown a satisfactory record of homework, laboratory, and test performance. (Talk to the instructor for an operational definition of "satisfactory").