Standard appeals to civic duty had plateaued UK organ donor sign-ups for years, so researchers tested eight competing messages on over a million real website visitors — and the one that won wasn't about duty at all, it was a question.

the problem

a public appeal has stopped working, but nobody knows which specific alternative wording would perform better without testing it live

background

the move

The Behavioural Insights Team ran a live, quasi-randomized trial between 24 June and 19 July 2013, showing one of eight message variants — a plain control plus seven theoretically distinct persuasive framings including social norms, a gain frame, a loss frame, cognitive dissonance, and reciprocity — to everyone in England, Scotland and Wales who renewed vehicle tax or registered for a driving licence online during the trial window. The reciprocity message read simply: 'If you needed an organ transplant, would you have one? If so please help others.'

the payoff

Across 1,085,322 site visitors, the reciprocity message produced 4,256 registrations versus 3,085 under the control message, an odds ratio of 1.38 and roughly a 38 percent relative increase, outperforming every other framing tested including social-norm and values-based appeals. Scaled to the full annual volume of GOV.UK transactions, the team projected the winning message would add approximately 96,000 additional organ donor registrations a year over the previous default wording.

what came after

The trial, published as a peer-reviewed study in the journal Trials in 2018, is cited in behavioral-policy circles as a rare large-scale, real-world demonstration that a simple reciprocity framing can outperform values-based and social-norm messaging for a civic ask, and the winning wording was adopted as the default message on the UK's national organ donor registration page.

references

1. [1]Effect of persuasive messages on National Health Service Organ Donor Registrations: a pragmatic quasi-randomised controlled trial with one million UK road taxpayersTrials (Springer Nature, peer-reviewed), 2018link.springer.com
2. [2]Applying Behavioural Insights to Organ DonationThe Behavioural Insights Team, 2013bi.team

was it genius?

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