Commitment & Consistency

Commitment & Consistency is Cialdini's second principle. The mechanism: humans have a strong drive to act in line with their previous actions and stated positions. Get someone to say yes to something small, and they're more likely to say yes to something larger that's consistent with that first yes.

It's the principle behind quiz-style ads, multi-step funnels, and "small initial action" CTAs.

How it shows up in DTC

• Quiz funnels — "What's your skin type?" answered honestly builds five micro-commitments that make the eventual product recommendation feel consistent with what the buyer already said
• Free trials — saying yes to a 14-day trial commits the buyer to the product framing in their mind; cancellation now feels inconsistent
• Email opt-in before purchase — committing to a relationship before committing to a transaction
• Low-commitment first CTA — "Take the quiz," "Get the guide," "See your match"

When it works

• High-consideration purchases — bigger commitments need a runway of smaller ones
• Niche categories — the small commitments self-select the right audience for the bigger ask
• Subscription products — committing to "try one month" feels meaningfully different from committing to "subscribe for life"

When it backfires

• Manipulative commitment ladders — when the small yes is engineered to manipulate rather than serve, sophisticated buyers spot it and bounce
• Forgotten initial commitments — if the buyer doesn't remember the small yes (because it happened 6 months ago), the consistency drive doesn't fire
• Mismatch between small yes and big ask — saying yes to "free wallpaper" doesn't commit you to buying $400 furniture. The two have to be consistent.

DTC example

A skincare quiz: "Answer 7 questions to find your perfect serum." The buyer commits to skin type, age, primary concern, current routine — 7 small yes-es. By the end, the recommended serum feels like the obvious consistent next step, not a sales pitch.

The quiz is the persuasion. The product page is where the buyer ratifies a decision they've already made.

Related concepts

• Reciprocity — often paired with commitment (here's a free thing → small yes → bigger ask)
• Cialdini's full set — commitment is one of seven levers; strong ads stack 2-3