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Cialdini's Six Principles of Influence

Cialdini's six principles of influence — reciprocity, commitment, social proof, authority, liking, scarcity — applied to ethical product design. When each works, when it crosses into dark patterns.

Primary source

Robert Cialdini, Influence: The Psychology of Persuasion, 1984. The most-cited book in marketing and sales.

What it is

Six durable persuasion levers: Reciprocity, Commitment / Consistency, Social Proof, Authority, Liking, Scarcity. Each is a separate psychological mechanism — they compound when used together, but each works alone.

When to use it

Marketing copy. Pricing. Testimonials. Case studies. Outreach sequences. Any moment where you need someone to act on incomplete information.

How I actually apply it

I audit which of the six are doing useful work on a given page, and which are missing entirely. Most B2B sites overuse Authority and ignore Reciprocity. Most consumer sites overuse Scarcity and ignore Liking.

Warning

Used predatorily, Cialdini becomes dark patterns. Fake countdowns, false social proof, manufactured urgency — all stem from misapplied Cialdini. The principles work; the ethics matter.

Want this applied to your product?

A Leak Audit takes one week and produces a prioritised fix list with every recommendation tied to a named framework — including this one. Fixed price: £1,000.