Leitner method flashcards work best when they test one specific fact with a short answer. Cards that are too long, too vague, or too list-heavy stay stuck in Box 1 because they’re impossible to evaluate quickly and accurately.
The One-Fact Rule
Every card you write for your Leitner system should test exactly one thing. Front: a specific question. Back: 1–5 words. If your answer is longer, the card isn’t ready yet.
Good Card Patterns
The most reliable card formats: cloze deletion (“The capital of France is ___”), simple Q&A (“What year was the Eiffel Tower completed? / 1889”), and process steps (“Step 2 of the Krebs cycle: / Citrate is formed”). Each tests one retrievable fact.
Bad Card Patterns
Cards that consistently fail have one of these problems: they contain a list, they have an answer longer than one sentence, the question is vague (“tell me about X”), or the answer was copied verbatim from a textbook. Download the Flashcard Quality Checklist to catch these before they enter your system.
Rewriting vs Repeating
If a card fails three times in a row, don’t review it again — rewrite it. A card that keeps failing is almost always a bad card, not a hard fact. See the Fix Bad Flashcards guide for rewrite patterns.
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