The Generation Effect
Make people complete the thought so the message sticks
- Difficulty
- Moderate
- Time to result
- ~weeks to results
- Steps
- 5
- Confidence
- 87%
Graf and Slamecka's 1970s studies gave people word lists; those who saw complete words (cat) recalled less than those who saw words with letters missing (c_t) and had to generate them, remembering 10 to 15 percent more. The reason is that the act of creation embeds the idea. For communicators this creates a tension with clarity: an ad must be easy enough to grasp yet leave the audience a role, or it is forgettable. A literal application is a cancer charity spelling O B _ S _ T Y. The higher form is lateral: The Economist poster reading management trainee, aged 42 forces readers to solve the implied insult themselves, generating the meaning and making it stick, while also being distinctive and softened by humour.
Origin
From Graf and Slamecka's 1970s University of Toronto memory experiments on generated versus read words, applied to advertising by Richard Shotton.
Core principles
- 01Information we generate ourselves is remembered better than what we are told
- 02The act of solving a puzzle glues the idea into memory
- 03Effective messages balance ease of understanding with a small gap to fill
- 04The general insight beats literal fill-in-the-blank application
How to run it
- 1
Isolate the core idea
Decide the one thing you want the audience to remember, because the generation gap must point at it.
- 2
Design a gap to complete
Remove a piece of the message, a word, a conclusion, an implication, so the audience must supply it themselves.
- 3
Calibrate the difficulty
Keep the puzzle solvable for most people; too hard and they walk past, too easy and there is no generation.
Pro tip Aim for the balance of ease and difficulty, understandable yet still requiring a small mental step.
Watch out If nobody solves it the message fails entirely.
- 4
Prefer lateral over literal
Rather than crude fill-in-the-blank letters, hide the conclusion so solving it feels like insight, as with the aged-42 trainee.
- 5
Layer distinctiveness and humour
Combine the generation gap with an unexpected angle and a light touch so an unflattering message lands without offending.
Pro tip Humour let The Economist call non-readers failures without insulting them.
In the wild
David Abbott's poster read I never read The Economist, signed Management trainee, aged 42. It never states you will fail without us; it sets an amusing puzzle readers solve themselves, generating the stinging conclusion. The effort of solving makes it memorable, its self-deprecation grabs attention, and humour lets the mean subtext land charmingly.
→ A classic long-lived ad remembered decades later.
A cancer research ad ran the line the second biggest cause of cancer is O B _ S _ T Y, forcing readers to generate obesity. It is a literal, pedestrian use of the effect but still works, sticking in memory because the reader completes the word.
→ A simple generation gap boosts recall of the health message.
Common mistakes
Spelling everything out
A fully explicit message is understood and immediately forgotten; leaving no role for the audience kills memorability.
Making the puzzle too hard
If the gap is unsolvable for most people the message is simply missed, so difficulty must stay within reach.
Is it for you?
Best for
Advertisers, copywriters and communicators who need a message to be memorable.
Not ideal for
Safety-critical or compliance messages where any ambiguity is dangerous.
From the transcript
“it's that act of creation that sticks the idea in in people's minds”
“he was setting up this interesting, amusing, reasonably simple puzzle that viewers had to solve”
From the episode
8 Fascinating Psychological Biases - Richard Shotton - #592
Richard Shotton