My implementation of mastery learning (along with other related ideas): <a href="https://github.com/trane-project/trane/">https://github.com/trane-project/trane/</a><p>It bothered me enough that there was not something like this already available, when the idea seemed so simple, that I ended up doing it myself. The user experience is not very polished yet, but I managed to turn the courses in here <a href="https://improviseforreal.com/learning-materials" rel="nofollow noreferrer">https://improviseforreal.com/learning-materials</a> into courses for this software that can teach you ear training and to improvise on any instrument in all keys, all modes, and most common chord progression. Currently, I am doing it for piano, but I've only reached about 15% of the total jam tracks so far. Obviously, I am not distributing the tracks myself.<p>I am pretty sure the main issue is that there's no one funding implementing these ideas. We've known about mastery learning, spaced repetition, interleaving, etc. for decades, but it's not all been put together into a coherent system. Something like <a href="https://mathacademy.com/" rel="nofollow noreferrer">https://mathacademy.com/</a> is similar, but it's not open sourced and cannot be used to create your own materials. No need for LLMs or anything fancier to be involved when there's so much low-hanging fruit that's not been implemented yet. The core of my software is just a depth-first search over a graph, lol.