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> I read a few years ago about a teacher (I think highschool) who put his lectures on YouTube for students to view in their own time and then used the in class hours for interaction, questions, tests.

That seems like a smart approach. It reverses the traditional model of "lecture in class, homework outside of class".

A smart approach that does not solve the AI problem - actually flipped classrooms work worse now due to AI usage.

My own experience with flipped classrooms (which seems to be shared by quite a few people who have tried it out): they only work well if all students actually read/watch the materials beforehand. In small, advanced courses, intrinsic motivation may be sufficient - but in most cases you need some extrinsic coercion - such as a mandatory quiz about the materials or hand-written lecture notes that need to be shown at each in-person session.

With AI, some people don't watch the lectures but let ChatGPT give them a summary which they submit. Then these people poison your in-person session with their lack of knowledge and motivation.

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My Cryptography professor did this during COVID, since the classes were split in person. It was an interesting model. I'm not sure if I loved it or not, but it was at least a change of pace. Getting 100% of the class time to ask questions was really nice, but it ended up with him re-teaching most of the online lecture in class because some quarter to half the class just didn't watch the lectures.

If done more stringently (if you didn't watch the lecture, I'm not reteaching it), it maybe would've had a bigger impact, but I'm not sure.

Office hours remained king for serious Q and A for the class.

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I always absolutely hated when a teacher did a reverse classroom and I had to “learn” at home and then practice in the classroom. I think the solution is more engaging lessons and less outside work. I know why homework exists, but homework is a chore that most people want to get done as fast as possible. If kids got to learn something interesting in school and then have their free time after school, there would be less dependence on AI. If they’re interested in the topic, they’ll put more effort into it. If not, they were never going to retain it anyway
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How does this scale in practice? We already require students be at school for 7 hours a day. If they now have to watch 3-4 hours of lectures at home every day, then students are left with little time to do anything else.

What about those students who don't have stable home environments? How are they supposed to find multiple hours a day to watch lectures?

How does this address the underlying issue of students off loading work? You've replaced homework with lectures, but haven't solved the problem of making sure the student is actually participating.

Logistically, this could only work if you shortened the school days, but then you would need to adjust the rest of society around that. Many parents structure their work days around their kids school schedules, and if kids need to go school later in the day, or get out earlier, that places a burden on the parents.

From my experience it works fine if it's one class that's doing it. If multiple classes are doing it then like you said it's literally a couple extra hours a day watching lectures and most students end up skipping them, forcing the instructor to end up teaching during class time anyways.
We’re discussing university, right? It’s supposed to be a full-time effort, at least for a normal pace undergrad or any post- graduate program.

For secondary school, I do agree with you - homework load can be problematic for some students. But at the same time, my honors classes all came with hours of homework and I’m not sure I would have been as prepared for uni without it.