Throughtout a semester students are added and dropped from your class. You will have to add and drop them from your gradebook. Through the video and handout you will see it is useful to specify the date of when a student enters the class or when they leave the class. If you specify when they leave the class their overall grade will reflect the last assignment they were present for. Something you may not be aware of is that even if they are dropped students and parents can still their grade in your class.