Definition
Compliance is the production of a specific behavior in response to a specific request. It is distinct from persuasion (which changes belief) and obedience (which follows an explicit command from an authority figure). Compliance is the working target of most everyday influence professions: the salesperson wants the signature, the fundraiser wants the donation, the recruiter wants the application. They generally do not need you to believe anything; they just need you to do something.
Robert Cialdini's Influence is a catalog of compliance levers, not of persuasion levers. The distinction matters because compliance is a much easier target — behaviors can be produced by triggering a cognitive shortcut without ever engaging the analytic system that would form a belief.
Why it matters
How it works
A compliance event has three stages: the request, the decision moment, and the behavior. The seven weapons of influence operate at the decision moment — they shape how the brain processes the request by triggering shortcuts that bypass deliberate analysis.
Because compliance only requires the behavior, not the belief, it can be produced very cheaply: a small free sample (reciprocation), a deadline (scarcity), a uniform (authority), a crowd (social proof). The operator does not need to argue; the operator only needs to stage the trigger.
The consistency principle then often does follow-on work: people who have complied with a request tend to retroactively update their beliefs to match (cognitive dissonance reduction). So the cheap behavior produced at the decision moment can ratchet into a stable belief over time, without the operator ever having directly attempted persuasion.