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The foot-in-the-door technique is a persuasion strategy where getting someone to agree to a small request increases their likelihood of complying with a larger request later. This works through the consistency principle: once people commit to something, they desire to maintain consistency in their actions. For example, a salesperson might ask you to try a product sample, then follow up with a purchase request.

The door-in-the-face technique reverses the strategy: a person first turns down a large demand, making them more likely to agree to a smaller request later. The requester appears to make a concession, triggering reciprocity—the person feels they owe a favor. For instance, after refusing a 30% salary increase, an employee becomes more likely to accept a 10% increase.

The consistency principle states that past behavior directs future responses; people want to maintain consistency once committed to something. When someone agrees to a small initial request, they internalize this commitment and are more likely to follow through with larger requests to remain consistent with their earlier decision and self-image.

Reciprocity is the principle that people feel obligated to return favors or make concessions when others do the same. In the door-in-the-face technique, when a requester appears to compromise by asking for less after an initial refusal, the person feels they owe the requester a favor, increasing their willingness to comply with the smaller request.

Freedman and Fraser (1966) demonstrated the foot-in-the-door technique by showing that participants who agreed to post a small sign were more likely to post a larger sign later. Cialdini and colleagues (1975) showed that participants who refused two years of community service were more likely to volunteer for an afternoon, supporting the door-in-the-face technique's effectiveness.

Companies use foot-in-the-door by offering discounted products or free trials, then upselling larger purchases. Door-in-the-face works through email offers or phone negotiations where initial high requests are followed by reasonable alternatives. Both techniques leverage motivational factors influencing attitude change to shift consumer behavior and increase sales across multiple transaction stages.

The same person must make both requests so the second, smaller request appears to be a genuine concession that both the requester and participant are making together. This consistency in the requester's identity strengthens the perception of compromise and reciprocity, making the participant more likely to feel obligated to accept the modified, smaller request.