Robert Cialdini

Who they are

Cialdini's methodology was unusual and is part of why the book has lasted. Rather than working only in the laboratory, he spent three years embedded in sales training programmes, for cars, encyclopedias, fundraising operations and used-car dealerships, learning what practitioners actually did and then testing why it worked. Influence, published in 1984, is the result: reciprocity, commitment and consistency, social proof, authority, liking and scarcity, each presented as a lever with experimental support behind it.

Pre-Suasion, in 2016, adds unity as a seventh principle and makes an argument that is undersold next to the famous six. The claim is that the moment before the request is where most of the persuasion is done: what has been made salient, what has been primed, how the situation has been framed. The six principles describe the ask. Pre-suasion describes the ground it lands on.

The replication record matters here and this site holds it principle by principle rather than as a verdict on the book, because Influence synthesises a great deal of other people's experimental work alongside his own. The short form: reciprocity is well replicated, including a 2020 direct replication of his own 1975 door-in-the-face study; commitment and consistency is not originally his and holds conditionally; social proof rests on the deep conformity literature and is solid at that level; and authority, liking, scarcity and unity have no replication record that could be established at all. That last group is flagged as unsettled rather than as debunked, and the difference is not cosmetic.

One thing belongs here for accuracy. No data-integrity problem in the surrounding compliance literature extends to his own publications, and this site asserts none.

Key papers

Cialdini, R. B. (1984). Influence: The Psychology of Persuasion. The six principles, and the book that made the field legible to practitioners.

Cialdini, R. B. (2016). Pre-Suasion: A Revolutionary Way to Influence and Persuade. The seventh principle, unity, and the argument about the moment before the ask.

Cialdini, R. B., et al. (1975). The door-in-the-face study, directly replicated in 2020. It is the best-evidenced of the principles and the one experimental result of his own that this site can point to with a replication attached.

Publishers and full citation details for these entries are not recorded in the vault and are not supplied here. The towel-reuse and Petrified Forest field studies are also his and reach this site through secondary treatment rather than through the primary papers.

Key ideas

Six principles, then seven. Reciprocity, commitment and consistency, social proof, authority, liking and scarcity, with unity added in 2016.

Pre-suasion is the underrated half. What is salient and how the situation is framed before the request does more work than the wording of the request.

The evidence is uneven and should be reported that way. Reciprocity is well replicated, including a direct 2020 replication of the 1975 door-in-the-face study. Commitment and consistency is not originally his and holds conditionally. Social proof rests on the conformity literature and is solid at that level. Authority, liking, scarcity and unity have no establishable replication record.

Unsettled is not debunked. Four of the seven sit in the first category and this site says so rather than rounding either way.

Three years inside sales training rooms. The method is why the book describes practice accurately even where the experimental support behind a principle is thin.

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