> This is one of many, many reasons why spaced-repetition systems should support dependencies - as in, "delay card X until after cards A, B, C have been solidly

> This is one of many, many reasons why spaced-repetition systems should support dependencies - as in, "delay card X until after cards A, B, C have been solidly learned. I half agree, but I think it works as is. You just manage the dependencies yourself. It's kind of an art, but you get a feel for how to do it. I find in practice it works without having to have the delay, though perhaps a delay would eek out marginally better performance. It's mostly just up to you figuring out the total set of things you need to be able to recall and whether to include any bi-directional facts or any meta-facts to aid the recall. As for the L1 -> L2 vs. L2 -> L1 debate: L2 -> L1 all day, every day.