How spaced repetition works

Back in the 19th century, psychologist Hermann Ebbinghaus showed that forgetting new material follows a predictable curve: memory drops fastest right after learning, and each successful recall flattens that curve out noticeably. Spaced repetition is a method built directly on that: instead of drilling everything every single day, a word or construction comes back for review right when you're about to forget it - not sooner (that wastes time) and not later (you'll have already forgotten it).

Exactly how this bot computes intervals

A correct answer doubles the interval until the next review, up to a cap of 60 days. A wrong answer immediately resets the interval to 1 day, and the exercise is due again today. The very first correct answer is a special case, though: the interval is already set to 1 day at that point, but the exercise stays available for the rest of that same day too - so a word you just learned can still be reinforced in the same session, rather than having to wait until tomorrow. The interval only starts genuinely stretching out across days from the second correct answer onward.

Why this matters especially for grammar

Most spaced-repetition apps are built around simple "word - translation" flashcards: great for vocabulary, but grammar constructions - which preposition a verb takes, in which case, where the finite verb runs off to after weil - don't fit neatly into a single flashcard. They still fade from memory along the exact same curve vocabulary does, though. Immer wiederholen applies the same proven method not to translating individual words, but to grammar constructions themselves: verb government, cases, forms, word order.