Timetable
The class schedule grid, and the substitutions that keep it true on the day.
The week as the school actually runs it — Monday to Saturday, because that is the working week in most Indian schools and a grid that stops at Friday is wrong for six days out of six.
Building the grid
A period belongs to a class, a subject and a teacher, in that order. The grid refuses a clash rather than accepting it and leaving you to notice: one teacher cannot hold two periods in the same slot, and neither can one section. That refusal is the feature — a timetable that accepts a double booking is discovered by a teacher standing in a corridor.
Substitutions
A published timetable is a plan, not a promise. When a teacher is absent the day's cover is recorded against the period, so the grid a class sees is what is actually happening rather than what was intended in April. Arranging cover is a delegatable duty: it does not have to run through the principal's console.
Who sees it
Teachers see their own week. Students and guardians see their section's. Nobody sees a draft — publish when the grid is settled, because a timetable that changes under a parent who has planned transport around it is worse than one published late.
Before the year starts
Classes, sections and subjects come from Academics, and staff from People. A subject with no teacher assigned cannot be timetabled, and that is the usual reason a slot refuses to fill.
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