A School time-table is one of the means by which we give opportunities to all pupil, a member of a class in a school, to study during a definite time (a school period) and place (a desk in a room: see below) a particular lesson, one of a prescribed syllabus in a subject, with the help of a particular teacher, member of the school staff. It thus involves a process of grouping the five variables—period, teacher, pupil, room and subject—according to certain desirable objectives and rules.