A school timetable is a table for coordinating these four elements: \n* Students \n* Teachers \n* Rooms \n* Time slots (also called periods) Other factors include the subject of the class, and the type of classrooms available (for example, science laboratories). School timetables usually cycle every week or every fortnight. The phrase "school timetables" largely refers to high schools, because primary schools typically have simple structures. High school timetables are quite different from university timetables. The main difference is the fact that in high schools, students have to be occupied and supervised every hour of the school day, or nearly every hour. Also, high school teachers generally have much higher teaching loads than is the case in universities. As a result, it is generally considered that university timetables involve more human judgement whereas high school timetabling is a more computationally intensive task, see constraint satisfaction problem. \n* Block: This term is ambiguous, but in this article it refers to a set of lessons of different courses that must be placed concurrently. \n* Student body: A set of students who are timetabled together, for example the 8A roll-call group. \n* Band (or Cluster): A set of classes involving the same student body, which are therefore horizontally linked, meaning they must be on separate periods \n* Year group or Year level: A set of students at the same stage of their schooling, for example Year 9. \n* Elective line: A block of many classes of many subjects such that each student may choose one subject from the line.

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