Guides · Memory
The tool is not the problem. The cards are. Here is what separates a card that teaches from a card that wastes your time.
Flashcards have a reputation as a technique for rote memorization of vocabulary, and for a lot of students that is all they are ever used for. That is a waste of a very flexible tool. Written well, flashcards can carry anything from a chemistry mechanism to the argument of a Supreme Court case. Written badly, they produce the familiar experience of flipping through fifty cards, feeling like you know them all, and then failing the test.
This guide is about the difference. It applies whether you use paper index cards or the Flashcard Builder on this site.
Each card should test exactly one thing, and the answer should be short enough to judge instantly as right or wrong. This is the "minimum information principle," and almost every bad flashcard breaks it.
Consider a biology card:
Front: Describe the stages of mitosis.
Back: Prophase: chromosomes condense, nuclear envelope breaks down. Metaphase: chromosomes line up at the metaphase plate. Anaphase: sister chromatids separate and move to opposite poles. Telophase: nuclear envelopes re-form, chromosomes decondense.
When you review this card, what happens? You remember three of the four stages, get one detail slightly wrong, and then have to decide whether that counts as "correct." It does not, but you will probably mark it correct anyway. Worse, you have no idea which part you are weak on, so you cannot target it.
The same content as five cards:
Front: Mitosis: what happens to the nuclear envelope in prophase?
Back: It breaks down.
Front: Mitosis: in which phase do chromosomes line up at the center of the cell?
Back: Metaphase.
Front: Mitosis: what separates during anaphase?
Back: Sister chromatids.
Front: Mitosis: what re-forms during telophase?
Back: The nuclear envelopes.
Front: Mitosis: the four phases in order?
Back: Prophase, metaphase, anaphase, telophase.
Five cards feels like more work. It is not. Each one takes three seconds to answer, and the deck tells you precisely which fact is not sticking. The big card would have taken thirty seconds and told you nothing.
For vocabulary, a card that goes from the foreign word to English tests reading; a card that goes from English to the foreign word tests production, which is harder and more useful for speaking and writing. Make both. For definitions, "What is opportunity cost?" and "What term means the value of the next-best alternative you give up?" are two different retrieval paths, and tests use both.
Do not do this for everything. A card asking "which date was the Battle of Hastings?" is useful; a card asking "what happened in 1066?" is usually less so unless your teacher tests that way.
A card that just says "Function?" on the front is unanswerable out of context. "In the cell: function of the mitochondria?" tells you which domain you are in. This matters more as decks get bigger and start mixing subjects. A good habit is to prefix cards with the topic, the way the mitosis examples above do.
Students often assume flashcards cannot hold anything beyond definitions. Some formats that work well:
A workable process: read the section once without writing cards. Then go back through it and, for each paragraph, ask "what would a test question about this paragraph look like?" Write that question. Most paragraphs yield one or two cards; some yield none. A twenty-page chapter usually comes out to thirty to sixty cards, which sounds like a lot and takes about twenty minutes a day to maintain under a spaced schedule.
If you find yourself with two hundred cards from one chapter, you are writing cards for details that will not be tested. Be ruthless. The point of a card is that you decided this specific thing is worth remembering.
The Flashcard Builder asks you to mark each card as "got it" or "still learning." The whole system depends on you being honest. "I would have gotten it with a hint" is still learning. "I got the idea but not the exact term" is still learning. A card that you mark as known and then miss on the test cost you more than a card you marked as unknown and reviewed twice more.
Finally, delete or rewrite cards that keep failing. A card that you have missed five times is usually a badly written card, not a hard fact. Split it, add context, or rephrase the question, and it will often click on the next review.