Spaced Repetition for All: Cognitive Science Meets Big Data in a Procrastinating World
Shane Mooney

Really awesome article. It’s exciting to hear that Quizlet is starting to move in the direction of long-term learning for users.
I had a quick question about the algorithm you guys developed:
It sounds like it was originally based off of the SM-2 algorithm and increasing delays by a little over twice the interval sounds like e-factors.

What challenges did you guys run into when implementing the algorithm without allowing the user to set scores (I remember supermemo uses 6, and Anki uses 4 different scores to set)?

And what prompted the shift from short to long-term studying solutions?

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