The principle. Joseph Nunes & Xavier Drèze's car wash study: two punch cards, one needs 8 stamps to earn a free wash, the other needs 10 — but starts with 2 already filled in. Same number of real stamps required (8). Result: the second card was finished at nearly twice the rate. People are more motivated to complete a goal when they perceive themselves as already in progress.
Sales applications.
- "You're already 60% of the way there." Frame their existing setup as partial progress toward your solution. "You've got the data, the team, the budget — what's missing is the activation layer. We're the last 40%."
- Pre-filled forms / proposals. Send the contract or onboarding form with their info already populated. Less friction, more "we've started this together."
- Onboarding meters. "Step 1 of 5 already complete (you've talked to me)." Now they're not at zero, they're at 20%.
- Renewals & upsells. "You've already got the foundation — adding [module X] gets you to the full vision."
The ethical line. The "head start" has to be real. Faking progress is manipulation; reframing genuinely-completed work as progress is honest persuasion.
Pair with. Commitment & consistency. Once they're "in motion" (endowed progress), small commitments (psy_commitment_consistency lesson) compound the effect.
Watch out for. Over-engineering the meter. A simple "you're 60% there" verbal cue often beats a fancy progress UI. The principle is about perception of momentum, not literal tracking.