Persuasion & consumer psychology · law 054
Commitment and Consistency Principle
By Shivam Bhandari · Reviewed 31 October 2026 · How we write
what it means
Once people commit to something, especially publicly or in writing, they feel pressure to act consistently with it.
How Commitment and Consistency Principle works
People want to see themselves as consistent. Small yeses lead to bigger yeses, and written commitments are kept more often than verbal ones.
In business, start with small, easy commitments, and get customers and teams to state goals in their own words.
where it comes from
Robert Cialdini's principle in Influence (1984). A well-known 1966 study by Jonathan Freedman and Scott Fraser showed people who agreed to a small request were far more likely to agree to a bigger one later (the ‘foot-in-the-door’ technique).
Commitment and Consistency Principle examples in business
Sales
A free trial or small first order makes a bigger contract more likely.
Teams
Team members who write their own goals follow through more than those assigned goals.
Appointments
Clinics that ask patients to write down their own appointment time see fewer no-shows.
How to apply it
- 1Design a small first step that customers can easily say yes to.
- 2Ask people to write down or say their commitments in their own words.
- 3Make commitments visible (public pledges, signed plans).
- 4Build a ladder of increasing commitments.
common misreading
Trapping people in commitments they regret damages trust. Use it to help people follow through on what they actually want.
ask yourself
What small first yes could lead a customer to your bigger offer?
put it into practice
Frequently asked questions
What is Commitment and Consistency Principle?
Once people commit to something, especially publicly or in writing, they feel pressure to act consistently with it. People want to see themselves as consistent. Small yeses lead to bigger yeses, and written commitments are kept more often than verbal ones.
Who came up with Commitment and Consistency Principle?
Robert Cialdini's principle in Influence (1984). A well-known 1966 study by Jonathan Freedman and Scott Fraser showed people who agreed to a small request were far more likely to agree to a bigger one later (the ‘foot-in-the-door’ technique).
How do you apply Commitment and Consistency Principle in business?
1. Design a small first step that customers can easily say yes to. 2. Ask people to write down or say their commitments in their own words. 3. Make commitments visible (public pledges, signed plans). 4. Build a ladder of increasing commitments.
What is a common misunderstanding of Commitment and Consistency Principle?
Trapping people in commitments they regret damages trust. Use it to help people follow through on what they actually want.