Anything that decides your study session for you is making a claim on your time, and the claim deserves scrutiny. Most schedulers answer "why this question?" with a number produced by a model nobody can inspect. That is fine while it feels right and corrosive the moment it does not.
What puts a question in the queue
- You got it wrong. The strongest signal, and the interval starts short.
- You were right but unsure. Treated as weak, because a guess that landed is not knowledge.
- You were sure and wrong. Returned soonest of all. An active false belief competes with the correction, so it needs more contact than something you simply never knew.
- Enough time has passed. Even a confident correct answer comes back eventually, further out each time it holds.
Getting something right does not remove it. It moves it further away.
When the queue is longer than the evening
It will be, regularly, and this is where most people abandon a scheduler. The queue is a priority order, not a contract. Working through the first twenty of sixty is a good session; the remaining forty are still in priority order tomorrow. Nothing is lost by not finishing, and treating the number as a debt is what turns a useful tool into a source of guilt.
Why questions and not cards
Scheduling the question itself means the review rehearses the same operation the exam asks for: recognise the scenario, discriminate between four plausible options, commit under time. A card asks you to recall a fact you have already been told is relevant, which is a materially easier task and a weaker rehearsal.
What happens if you stop for a fortnight
Nothing breaks. Items that were due stay due, in the same priority order, and the queue on your return is simply longer. It is not a debt that compounds, and there is no penalty to work off — a point worth knowing in advance, because the fear of returning to a large number is what stops people returning at all.
The one real cost is that some items will have slipped past the interval where a reminder would have been cheap, so a few will feel like re-learning rather than reviewing. That is a small price and it is recovered within a week.
What a review should feel like
Slightly hard. If a review is instant and effortless, the interval was too short and you have spent a repetition on something that did not need one. If you have no idea at all, it was too long and you are re-learning rather than reviewing. The useful zone is the uncomfortable middle where it takes a moment and then arrives.
If your reviews all feel easy, the schedule is being too kind to you.
Interrogating a scheduler is reasonable
Anything that decides how you spend an evening should be able to explain itself in a sentence. Ours can: this question is here because of what you answered, how sure you were, and how long ago. If a tool cannot answer that, the appropriate response is not deference — it is to check whether its suggestions match anything you would have chosen yourself.
Seeded from what you have already done
A scheduler that starts empty is useless for weeks, which is long enough for most people to stop opening it. Ours was built from existing attempt history, so it had a sensible queue on the first day rather than after a month of re-answering questions you had already met. It is live for every account.