The same three teachers always get the cover — and that is a fairness problem

Every school has them: the two or three teachers who somehow always end up covering. Not because the timetable says so — because the hallway does. Over a term, those extra covers are a second, invisible timetable stacked on top of the printed one — and it is never fair.

How informal cover assignment picks its people

When cover is decided in corridors, the selection logic is human and predictable:

• Proximity bias — the teacher who happened to walk past the office gets the class.
• The kindness tax — the colleague who never says no gets asked most, precisely because they never say no.
• The seniority shield — senior or assertive staff quietly opt out; junior staff absorb the difference.
• Visibility bias — teachers whose free periods are known get drafted; those in distant wings are forgotten.

None of these axes are fair. They are just convenient at 7 AM — and convenience compounds. By mid-term the gap between the most- and least-covering teacher can reach double digits, entirely by accident.

Why untracked covers corrode trust

Teachers keep mental tallies even when the school does not. When a teacher believes — correctly or not — that they cover more than their peers, three things follow: resentment toward coordinators, reluctance to cooperate next time, and a grievance nobody can settle because nobody has the numbers. "You always get chosen" is an argument. "You covered 11 lessons; the average is 9" is a conversation.

What a cover ledger changes

The fix is boring in the best way: record every cover, automatically. A dated ledger — who was absent, which lesson, who covered, the reason, whether it was fulfilled — converts an invisible burden into visible data:

• Fairness becomes checkable. Per-teacher cover totals for any date range, exportable to CSV for the weekly meeting.
• Decisions defend themselves. When a teacher asks "why me again?", the answer is a report, not a memory.
• The picker itself gets fairer. In Haneen's Substitutions screen, every candidate shows their covers-this-week count inline — the moment of assignment is where balance actually happens.
• Fulfillment is provable. A simple "fulfilled" tick distinguishes an assigned cover from a confirmed one — closing the loop that corridor arrangements never close.

Fairness is not just a September problem

Schools invest real effort in a fair term timetable — balanced loads, spread days, capped consecutive periods. Then the daily cover process quietly redistributes work with none of those guarantees. A ledger extends the same discipline to the operational layer: the fairness you built in August should still be true in March.

The principle is the same one behind the whole system: workload should be counted and balanced, not assumed. Covers are workload. Count them.