Start with a minimal, easy-to-agree request

The first ask should be small enough that virtually anyone would say yes.

Why it works

A yes to a small request begins a self-perception update: "I agreed to this, which means I must be someone who cares about this kind of thing." The smaller and more voluntarily the agreement, the stronger the self-attribution — because the person cannot explain their compliance by social pressure or large incentives. That self-attribution then becomes an anchor for future behavior consistency.

How to do it

1. Identify the smallest genuine commitment that is relevant to your ultimate ask.
2. Make it easy to say yes to: a two-minute survey, a single question answered, a one-sentence opinion.
3. Give a clear out — don’t pressure; the compliance must feel voluntary for the effect to operate.

Evidence

Freedman & Fraser (1966) found that California homeowners who had agreed to a small sign ("Be a safe driver") were significantly more likely to allow a large, ugly billboard on their lawn weeks later than those who received only the large request. The original study has been replicated and extended across contexts. (observational)

Meta-analyses find moderate but variable effect sizes (d ≈ 0.2 to 0.5 depending on study design); effect is larger when the initial request is related to the second and when the same requester is used.

Sources

• Freedman & Fraser (1966), Compliance without pressure: The foot-in-the-door technique, Journal of Personality and Social Psychology
• Burger (1999), The foot-in-the-door compliance procedure: A multiple-process analysis and review, Personality and Social Psychology Review

Common mistake

Making the initial ask so obviously a setup for the real ask that the person declines the small request strategically — "if I say yes to this, I know what’s coming."