very important but hard to formulte. I’m never happy with the wording of mine…. or with my enforcement of it.
I found this one online and thought it pretty good.
Regular Attendance is required in this class. Repeated absences will not be accepted without penalty. Furthermore, students who arrive late or leave early will be counted as absent. Students who miss more than three classes risk having their final grade dropped one letter for each ensuing absence. Students who miss more than six classes will automatically fail the course. If you believe that you will be unable to adhere to this requirement, for whatever reason, then it is strongly recommended that you take this course some other quarter.