L·04
Learning & Memory
Desirable Difficulty
Fluency is a false signal. Conditions that slow learning down usually improve retention.
- Evidence
- proven
- Topic
- Learning
- Things to do
- 3
- Read
- 1 min
provenHow strong is the evidence?
Tested again and again, by different people, and it keeps coming out the same. You can lean on this.
- Robert & Elizabeth Bjork, 1994 onward
- “storage strength vs retrieval strength”
Why it works
How easily something comes to mind now says almost nothing about whether it will come to mind in six months. We monitor the wrong variable.
What to do about it
- Distrust the feeling of “I've got this”. Test instead.
- Deliberately introduce difficulty: recall without notes, longer gaps, varied conditions, worse handwriting.
- Judge learning only by delayed performance, never by in-session ease.
Where people go wrong
Choosing the study method that feels most productive. It is nearly always the least effective one.
Read next
- Retrieval Beats ReviewTrying to recall something strengthens memory far more than reading it again. Rereading mostly builds confidence.proven
- SpacingThe same total study time, spread out, produces far more durable memory than massed together.proven
- InterleavingMixing problem types during practice feels worse and performs better than doing them in blocks.proven
- Guess Before You're ToldAttempting an answer before learning it improves later retention — even when the guess is wrong.solid