Robert Cialdini spent three years undercover. He took jobs at car dealerships, sat in on telemarketer training, joined cults — anything that would let him observe persuasion in the wild. Influence is the result: six principles distilled from that fieldwork, each backed by experimental evidence accumulated over the next forty years. Reciprocity, commitment, social proof, liking, authority, scarcity. The book has shipped more than five million copies because the principles are real and the writing is uncommonly clear.
The three books below extend it in three directions. The first is Cialdini's own sequel, which adds a seventh principle and reframes the others. The second is the behavioural-economics literature that grew up in parallel. The third is the question Influence does not quite answer: why some messages stick at all.
Pre-Suasion — Robert Cialdini
Simon & Schuster, 2016
Thirty-two years after Influence, Cialdini wrote the follow-up. The argument is that the moment of persuasion is not when the request is made — it is the seconds before. What attention is primed, what concept is mentally accessible, what frame is already in play. The book is structured around a seventh principle, "unity," but its real contribution is the systematic case for setup. Cialdini reads almost everything he writes about; the citations are dense and the experimental detail is satisfying.
The best persuaders become the best through pre-suasion — the process of arranging for recipients to be receptive to a message before they encounter it.
Read after Influence to see how the field's senior figure now thinks. The original principles still hold. What changed is his sense of when they actually fire.
Predictably Irrational — Dan Ariely
HarperCollins, 2008
Ariely runs the Center for Advanced Hindsight at Duke, and his book is the popular treatment of his own experimental work on the systematic ways people violate standard economic rationality. Free is not free. Anchoring distorts almost every estimate. Self-control is reliably worse in arousal than in calm. The studies are more careful than the genre standard, and the book belongs on the shelf next to Influence as the bridge between persuasion research and the wider behavioural literature.
We have a longer note on what to read after Ariely as well. And on the foundational text that sits underneath both, Kahneman's Thinking, Fast and Slow.
Made to Stick — Chip Heath and Dan Heath
Random House, 2007
The Heath brothers — one a Stanford professor, one a writer — set out to answer a different question. Cialdini explains how to get a yes. Made to Stick explains why some ideas survive the journey from one mind to another and most do not. The framework is six properties, the SUCCES checklist: simple, unexpected, concrete, credible, emotional, story. It sounds glib in summary. In the book it is supported by careful case studies — the urban legends that propagate, the public-health messages that don't, the political slogans that outlast their elections.
The natural pairing with Influence. Cialdini gets the request accepted in the moment. The Heaths explain why the message is still alive next week.