The classroom is your most expensive user-test

You can run a year of usability sessions and still miss the thing that kills your product: the moment a teacher decides it costs more than it gives back. That decision happens in a lesson, under time pressure, with thirty pupils — not in a moderated interview.

Features teachers “quietly switch off” rarely fail because they’re broken. They fail because they ask for thirty seconds the teacher doesn’t have, or because they assume a calm room that doesn’t exist. None of that shows up in a demo.

The fix isn’t more research. It’s getting the classroom into the room while you build — someone who has taught the lesson and can tell you, before launch, exactly where a real Tuesday will break what you’re shipping.