The four usual causes
- Not enough specialist sessions to release every teacher. This is the most common cause.
- A class whose job-share partners between them need more release than that class receives in specialist sessions.
- A specialist restricted to so few classes or days that their sessions cannot reach everyone who needs them.
- Fixed events or time blocks that remove so many slots that what remains cannot hold the week.
How to narrow it down
- 01Read the Final Check first. It names the constraint and usually the people affected.
- 02Check whether the spare-time setting is on, because a school can look short when it is not.
- 03Compare total release needed against total specialist sessions available. If supply is lower, stop scheduling and fix supply.
- 04Look at any class where two teachers share the week and count the specialist sessions that class receives.
If it still will not build
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Last updated 20 August 2026