Having now discovered that Quantum Country users seem to forget most prompts quite slowly and that Quantum Country users rarely forget after demonstrating five-day retention, we should experiment with some much more aggressive schedules for Quantum Country.
In terms of actually designing the schedules, this is a good reference: Spitzer, H. F. (1939). Studies in retention. Journal of Educational Psychology, 30(9), 641–656. Some desiderata:
Schedules:
A: [20] 1 week / 3 weeks / 3 months / 9 months
A’: [5] 1 week / 6 weeks / 4 months / 1 year
B: [20] 2 weeks / 6 weeks / 4 months / 1 year
B’: [5] 2 weeks / 3 months / 9 months
C: [20] 1 month / 3 months / 9 months
C’: [5] 1 month / 6 months / 1 year
D: [20] 2 months / 4 months / 1 year
D’: [5] 3 months / 6 months / 1 year
Same-time comparisons:
Initial forgetting curve points: 1 week / 2 weeks / 1 month / 2 months / 3 months
ISI / RI combinations:
Motivated by Quantum Country users who forget in-essay exhibit sharp forgetting curves, I think I’d like to make forgotten prompts (either in-essay or relative to the first level) repeated after 1 day.
I’m little concerned about jumping from 1 day to these other minimum intervals, but I have enough span across the schedule variants that I’ll at least get to see what happens and really understand it.
Implementation-wise, the key “weird” thing that needs to happen here is that when you complete a needsRetry prompt with no bestInterval, we need to go to this minimum level instead of the first “real” level.