Reinforcement isn't a newsletter. It's a short reminder of exactly the part you skipped.
After the certificate comes the part most trainings skip. For 60 days there is at most one message per week, tied to a module you completed but stopped using.
Why spaced and not all at once
What you learn in a single day and then don't use drains away. Ebbinghaus mapped that curve in 1885; his figures come from a trial with nonsense syllables on one subject, so don't take them literally. The pattern has been found again ever since, and it is why a training day without a follow-up delivers so little.
The practical translation is not complicated: repeat something just before you would forget it, and next time the interval can be longer. Hence the challenge as early as day seven and the refresher only on day thirty. Not because 60 days is a magic number, but because it is long enough to run through a few of those intervals and short enough to still belong to the training.
What returns, and what doesn't
- A module you completed but never touched again. That is the signal we act on, not your score.
- A practical assignment that only unlocks days after the certificate, so there is something to do and not just something to read.
- No general tips, no newsletter, no product news. Anyone waiting for that doesn't need the reinforcement.
The throttle on reminders
Whoever doesn't respond gets less mail, not more. Three times no response means stopping. That costs some completion rate and buys calm; we make that trade deliberately.
The same throttle sits on the button an employer uses to nudge someone: if they already received something in the past week, you cannot mail them again. Without that limit such a button becomes a spam generator, and then the first thing people learn is that they can ignore this sender.