How to write a flashcard that actually works

A badly written flashcard is not merely useless: it wastes your time every time it comes back, and it puts you off the method. Here is what separates a good card from a bad one.

One card, one thing

This is the rule that matters most, and the one broken most often.

Bad — What were the causes, the stages and the consequences of the 1929 crash?

That card is impossible. You will know half of it, you will hesitate over whether to mark yourself correct, and the program will learn nothing from your answer. It will keep coming back without ever consolidating.

Good — Which event triggered the 1929 crash? Good — Which American protectionist measure deepened the crisis in 1930?

One notion per card. If your answer contains a list separated by commas, split it.

The answer must be short

If the back of the card runs to four lines, you cannot honestly check whether you knew it. You will read it, find it familiar, and mark yourself correct. That is the illusion of mastery in another form.

Aim for one line. Two at most.

Ask the question the way the exam will

A card reading "the Reformation → 1517" trains you to recognise a date. If the exam asks the reverse, you will be stuck.

Think about what you will be asked to produce, and train that direction. For vocabulary, do both: they are two distinct skills, and being able to translate from Spanish into English does not give you the reverse.

Ban implicit context

Bad — What is the third condition?

In six weeks this card will mean nothing. You will not remember what it is about, and you will have to reopen your notes — which cancels the whole benefit.

Every card must stand on its own. Name the subject in the question, even if it feels redundant as you write it.

Prefer cloze deletions for definitions

For a sentence you must reproduce almost word for word — a statute, a formal definition, a formula — cloze deletion beats question-and-answer. It preserves the structure of the sentence, and that structure is itself a memory aid.

Anki calls this the cloze format. A single sentence can carry several gaps and generate several cards.

Do not memorise what you do not understand

Spaced repetition engraves things into memory. It does not explain them.

A card learned without understanding becomes a string of sounds you can recite but cannot use. Understand first, build the card second. If a notion resists, it is the lecture you need to revisit, not the card you need to see more often.

The hidden cost of all this

These six rules are simple to state and tedious to apply. Properly breaking down a thirty-page chapter takes a solid hour, and that hour comes before the first review — at the exact moment when motivation is lowest.

It is the most common reason people abandon Anki. Not the interface, not the algorithm: the fact that the program has to be fed by hand.

Automatic generation does not replace your judgement — always read what comes out, correct it, delete what does not serve you. But it removes the hour of breaking down, and that is precisely the obstacle that makes people give up.