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Case · All × Start ("why we measure"; a science anchor, not a product)

The hotel towel study: “guests in this room”

Goldstein, Cialdini and Griskevicius tested hotel cards asking guests to reuse towels. Saying most guests reuse their towels beat the standard environmental appeal, and the norm of guests who had stayed in the same room worked best (Journal of Consumer Research, 2008).

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The outcome · 2008

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.

Case grade for the number: A. Evidence grade for the mechanism link: A.
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Stage cell: All × Start ("why we measure"; a science anchor, not a product).

What they did. Two field experiments in a hotel varied the card in each room: the standard environmental appeal versus descriptive norms about what other guests do, including guests who had stayed in the same room.

The mechanism. Social proof from similar others INF-T-SP-17 (Influence Ch.4, p.107), placed at the moment of decision INF-T-SP-12 (Influence Ch.4, p.98). In Octalysis terms, a conformity anchor GT#58 (Actionable Gamification Ch.9, p.224): feedback on where you stand against the norm. The closer the reference group, the stronger the pull ("provincial norms").

The outcome. 49.3% reuse (same-room norm) (2008) Case grade A. From a regulator, a public filing or a peer-reviewed study. vs 37.2% for the standard message; in the first experiment, 44.1% vs 35.1%.

What it means at your stage. Use specific, true comparisons with the closest reference group you can honestly name: same plan, same team size, same city. Generic "join millions of users" claims are the weakest version.

Caveats. One US hotel; reuse recorded by housekeeping. Replications are mixed: later hotel studies, including German replications, found weaker or no norm effects, so test the message locally. The study post-dates the edition of Influence our content cites, so it is research, not book content. Mechanism link Evidence grade A. Robust evidence: replicated, peer-reviewed research..

Would you have called it?

This case is also a round of Predict the Outcome: read the situation, pick what you think happened, then see the evidence.

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The techniques behind it

Each one is a starting point, not a recipe. Gamify It turns a technique into an experiment card for your product: the change, the metric, the guardrail and how long the test needs at your traffic.

  • TechniqueEvidence grade B. Moderate evidence: solid studies with some limits.

    Proof from similar others

    people like you

    Choose testimonials, case studies and usage data by the visitor's industry, role, size, country, language or experience level, and let users filter reviews by "people like me". People follow those who resemble them far more than generic crowds.

  • TechniqueEvidence grade B. Moderate evidence: solid studies with some limits.

    Proof at the moment of uncertainty

    proof placed where people hesitate

    Map where users are most unsure (the first visit, plan selection, payment, permission prompts, empty screens, new features) and put honest evidence right there: "Most teams of your size pick this plan", "7 in 10 new users begin with this template". Proof works best under uncertainty, so place it at the hesitation and use less in expert flows.

  • TechniqueEvidence grade B. Moderate evidence: solid studies with some limits.

    Conformity Anchors (GT#58)

    true peer benchmarks

    Feedback that shows users how they compare with a relevant norm, such as how many campaigns similar teams send compared with theirs. Chou's lesson from home-energy reports: users already above the norm can slide back toward it unless they are recognized for beating it.

  • TechniqueEvidence grade B. Moderate evidence: solid studies with some limits.

    Positive norms, never 'many people do the bad thing'

    positive peer-norm copy

    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.

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
  • No success is attributed to a single technique: real outcomes have many causes.
  • Company names are used editorially; no endorsement is implied.

Sources

Source IDs: CASE-M32INF-T-SP-17INF-T-SP-12GT#58

Book content is paraphrased, never quoted at length. Last verified October 24, 2026.

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