Key takeaways

  • Agreeing to a small request makes people more likely to agree to a larger one, partly because they start to see themselves as the kind of person who says yes.
  • In a 1966 study, 76 percent of people who had been asked to show a small safe-driving sign agreed to a large lawn sign, compared with 17 percent of people asked only for the large one.
  • Later research found the effect real but usually much smaller, and a direct replication found no significant effect in its 2013 runs.
  • Free trials, $1 first months and quizzes work as small yeses that set up the next, bigger purchase.

At a glance

In one line
Saying yes to a bigger request after agreeing to a small one, to stay consistent with your earlier choice.
Also called
Foot-in-the-door technique, Consistency principle
First described by
Jonathan L. Freedman and Scott C. Fraser (the foot-in-the-door technique); named as a principle of influence by Robert B. Cialdini (1984), 1966
Original study
Freedman, J. L., and Fraser, S. C. (1966). Compliance without pressure: The foot-in-the-door technique. Journal of Personality and Social Psychology, 4(2), 195 to 202.

Commitment and consistency is the pull to keep saying yes once you have said it once. Agree to a small request, and you become more likely to agree to a bigger one later. Part of the reason is that you now see yourself as the kind of person who does this.

That matters for spending because so many purchases start with something tiny: a free trial, a $1 first month, a short quiz, a free loyalty sign-up. None of them costs much. Each one makes the next, larger yes feel like the natural thing to do.

The sign on the front lawn

In 1966 the psychologists Jonathan Freedman and Scott Fraser set out to answer a simple question. How do you get someone to do something they would rather not do, without pressuring them? Their answer came from two field experiments.

In the first, researchers phoned women at home in Palo Alto, California. The callers said they were from a consumer group and asked a few questions about the household products the women used. Three days later came a much bigger favor. Would the women let five or six men come into the house for about two hours to go through it and list its household products? Women who had answered the short questionnaire were more than twice as likely to agree as women who were asked only the big favor.

The second experiment was bolder. One researcher asked people a small favor, such as putting a little sign reading “Be a safe driver” in a window. Later a different researcher asked them to put a large, unsightly “Drive Carefully” sign in the front yard. Of the people who had been asked about the small sign, 76 percent agreed. Among people asked only for the big sign, 17 percent did.

The striking part was that a second person could cash in on someone else’s small request. Freedman and Fraser called the method the foot-in-the-door technique, and they ran several extra groups to work out why it worked. Years later, the psychologist Robert Cialdini made the broader idea one of six widely known principles of persuasion in his 1984 book Influence, in a chapter titled “Commitment and consistency: Hobgoblins of the mind.”

Smaller than the famous version

The effect is real, but the 1966 numbers set a bar later studies have not reached. The psychologist Jerry Burger reviewed the research in 1999 and found cases where the small first request failed or even lowered compliance. Many studies show the tactic works, yet the effects in meta-analyses tend to be low. The psychologists Malgorzata Gamian-Wilk and Dariusz Dolinski repeated the original experiment directly in Poland and Ukraine, in 2003 and again in 2013. In 2003 it worked in Ukraine but not in Poland. By 2013 it made no significant difference in either country.

Why one yes invites the next

Burger’s review points to several processes working at once. One is self-perception: after you agree to something small, you start to see yourself as someone who helps, agrees or cares about this kind of thing. Another is the wish to stay consistent with what you have already said or done, along with the sense of being committed.

Burger also listed conformity, attributions and psychological reactance, the urge to push back when you feel pushed. Together, these processes explain both the times the technique works and the times it backfires.

How a $1 month becomes a habit

Say a fitness app offers its premium plan for $1 for the first month. You sign up, which costs almost nothing. A month later the plan rolls to $15 a month, and you keep it, because you are a member now and members work out. Then the app offers a $40 equipment add-on for members, and buying it fits the person you have decided you are. At renewal time it suggests a yearly upgrade, and saying no would feel like admitting the whole thing was only a trial. This is the Diderot effect in miniature, one purchase making the next feel necessary, and status quo bias keeps each step in place once you take it. The first dollar did not buy much. It bought a new self-image.

Where the small yes is asked for

Look for the cheap or free first step that comes before the real offer.

  • Free trials and $1 first months. The price is low so the yes is easy, and the real decision gets made later, by default.
  • Small first orders and sample kits. A starter size or trial pack makes you a customer before you have agreed to the full price.
  • Quizzes and wish lists. Telling a seller your style, goals or favorite items is a statement about who you are, and the recommendations that follow ask you to live up to it.
  • Loyalty sign-ups. “Join for free” turns you into a member, and members get member offers.
  • Little agreements before the pitch. A request for your email, a quick review or a button that reads “Yes, I want to save” puts a yes on record before the price appears.

How to answer the next request fresh

  1. Name the small yes. When you start a trial, join a list or fill out a quiz, say to yourself what it is: the first rung of a ladder.
  2. Judge each step as if it came first. Before an upgrade or add-on, ask whether you would say yes if this were the opening offer. If not, the earlier yes is making the decision.
  3. Separate who you are from what you buy. Being a runner does not require the next gadget, and being a member does not require the member deal.
  4. Put the wait on the upgrade. Use the 30-day rule on the second and third purchases, not just the first, since that is where the ladder climbs.
  5. Add up the ladder. Enter the trial price, the monthly plan, the add-ons and the yearly upgrade into the Chain Cost Calculator, and look at the total before the first step, not after the last.

When staying consistent pays off

Keeping your word is usually a good trait, and the same pull works for you when you aim it yourself. A small public promise to save, or a first easy step toward a goal, can make the next step easier for the same reasons a free trial does. The difference is who picked the destination.

So before the next yes, ask one question. Did you choose where this commitment leads, or did someone hand you a small yes so they could cash it in later? If you chose it, keep going. If they did, start the decision over.

A spending example

You pay $10 for a skin care sample kit with five tiny bottles, mostly to try them. A week later you have filled out the kit's follow-up quiz and told the seller your routine, so buying the full-size cleanser and serum at $45 each feels like the obvious next step. Within a month you are on a $90 refill plan for products you only meant to test.

How sellers use it

Sellers rarely open with the big ask. They start with a free trial, a $1 first month, a style quiz, a free loyalty sign-up or a request for your email address, then follow with a paid plan, an upgrade or an add-on pitched to you as an existing member. Each step is framed as the natural next move for someone like you.

How to push back

Before you accept any upgrade, add-on or renewal, ask whether you would say yes if this were the first thing the seller had asked. If not, the earlier yes is doing the deciding. Put a note in your calendar for the day each trial ends, and decide then from scratch.

Questions readers ask

How is commitment and consistency different from reciprocity?

Both are on the psychologist Robert Cialdini's list of six widely known principles of persuasion, but they pull different levers. Reciprocity works through a gift. Someone gives you something, and you feel you owe them in return. Commitment works through a small yes. Once you have agreed to something, you start to see yourself as the kind of person who agrees, and the next request fits that picture. One leaves you with a debt to repay. The other leaves you with a self-image to live up to.

Is it the same as the sunk cost fallacy?

No, though the two often work together. The sunk cost fallacy is continuing because of money you have already spent. Commitment and consistency can work with no money spent at all, just an earlier yes, such as a quiz you filled out, an email address you gave or a free plan you joined. Once you do start paying, both pulls can stack, since quitting would mean writing off the money and acting against the person you said you were.

How does it relate to the Diderot effect?

The Diderot effect is the chain in which one new purchase makes the things around it feel wrong, so you buy more to match. Commitment and consistency explains part of that pull. The first purchase makes you a person who owns that kind of thing, and the next purchases keep you consistent with that identity. Buy one good pan and you become someone who cooks seriously, and serious cooks, the thinking goes, need the knives too.

Sources

  1. Freedman and Fraser (1966), Compliance without pressure: The foot-in-the-door technique, Journal of Personality and Social Psychology 4(2) The two original field experiments with a small request first and a larger one later.
  2. Burger (1999), The foot-in-the-door compliance procedure: A multiple-process analysis and review, Personality and Social Psychology Review 3(4) A review of the research and of the several processes, from self-perception to consistency, that drive the effect.
  3. Gamian-Wilk and Dolinski (2020), The foot-in-the-door phenomenon 40 and 50 years later: A direct replication of the original Freedman and Fraser study in Poland and in Ukraine, Psychological Reports 123(6) A direct replication in which the effect weakened over time and later disappeared.
  4. Influence: The Psychology of Persuasion (Robert B. Cialdini, Morrow, revised edition 1993), library record The book that made commitment and consistency one of six widely known principles of persuasion; first published in 1984.
  1. Reciprocity

    Effect: Feeling you owe something back after a gift or favor, and repaying it by buying from the giver.

  2. Sunk cost fallacy

    Effect: Continuing to spend time or money on something because of what it already cost, not what it will deliver.

  3. Choice-supportive bias

    Effect: Rating something higher after choosing it, and remembering the rejected option as worse than it was.

  4. Status quo bias

    Effect: Sticking with the current or preset option, even when a different choice would serve you better.

  5. How marketers use the Diderot effect

    The Effect: Sellers know the first sale is the hardest one. After that, the pull toward a matching set does much of their work. Eight tactics, how to spot each one, and what to do instead.

  6. The 30-day rule

    Playbook: Write it down, wait a month, then decide. A waiting rule that takes the heat out of a purchase without taking the pleasure out of buying.

Page history: first published .