Technique · Actionable Gamification
Positive norms, never 'many people do the bad thing'
Write messages that show the desired behavior as common among people like the user, and never advertise how common the unwanted behavior is. Chou's warning case: a park sign saying many visitors take wood raised theft compared with no sign at all.
Plain label: positive peer-norm copyAlso known as: Anti Core Drive copy, descriptive norms
How it works
Other people's behavior signals what is normal (CD5), so a message saying many people do the wrong thing makes it look acceptable, a motivation against the Desired Action created by the copy itself. In the park test a negative-norm sign raised theft above the no-sign control, while a plain request lowered it. The closer the reference group, the stronger the norm, and in one field study a neighbor norm beat appeals to money, the environment and duty.
Evidence warning
At least one replication of the hotel-towel norm studies reported a weak or null effect; always keep a true no-message control.
What the research says
In the Petrified Forest sign test, theft was about 7.9% under a negative-norm sign, about 3% with no sign and 1.67% with a plain request.
AG Ch9 citing Cialdini and colleagues via Yes! (study grade A; control often given as 2.92%)
In San Marcos, door hangers citing neighbors' energy saving cut use by about 10% vs control, while money, environment and civic-duty appeals each moved it less than 3%.
AG Ch9 citing the WSJ; Nolan et al. (study grade A), 2008
How to build it
- Web
- State, with real data, how many new teams invite colleagues in their first week, never how many never do.
- B2B
- Admin nudges framed around similar companies that completed setup, never around how many skip security steps.
- Email and SMS
- Re-engagement emails describing what active members like the user did this week.
What can go wrong
- Copy that publicizes how common the bad behavior is.
- Fabricated statistics.
- A reference group users don't identify with.
Pairs well with
- Test against a true no-message control.
- Pair with GT#58 Conformity Anchors for individual feedback.
In practice
Where it shows up
Hotel field experiment (Goldstein, Cialdini & Griskevicius) · 2008
RoundThe hotel towel study: “guests in this room”
Experiment 1: 44.1% towel reuse with the descriptive norm vs 35.1% with the environmental appeal. Experiment 2: the same-room norm reached 49.3% vs 42.8% for the other norm messages combined, and the standard message 37.2%. Peer-reviewed field experiments.
StartCase grade for the number: A. Evidence grade for the mechanism link: A.Opower · 2014
RoundOpower: your energy use vs your neighbors'
Average energy reduction of about 2.0% (1.4-3.3% across 12 utilities) in a randomized evaluation of 588,446 households; homes dropped after about two years still saved about 2% (Allcott & Rogers, American Economic Review, Oct 2014; via J-PAL). Oracle bought Opower in 2016 (~$532M).
M3 ×StayCase grade for the number: A. Evidence grade for the mechanism link: A.
Limits
What we don’t claim
- Octalysis is a practitioner framework built from observing games, not a validated scientific model.Actionable Gamification Ch.15, pp.399-400
- Left Brain and Right Brain are a metaphor for extrinsic and intrinsic motivation, not a claim about neuroscience.Actionable Gamification Ch.13, pp.342-343
Sources
Actionable Gamification · Yu-kai Chou
Ch.9, p.201 · Ch.9, p.202 · Ch.9, p.203 · Ch.9, p.204 · Ch.9, p.205 · Ch.9, p.206
Source IDs: CD5
Book content is paraphrased, never quoted at length. Last verified October 24, 2026.
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