Framework · Behavioral science
Peak-end rule
People remember an experience mostly by its most intense moment and by how it ended, and largely ignore its length. Make the aha moment reliable and design the end of onboarding, purchases and cancellations. Strong evidence on remembered evaluations (A-).
Plain label: memorable peaks and good endingsAlso known as: peak-end, duration neglect, end on a success
Core idea. The remembered experience, not the moment-by-moment one, drives the decision to return, buy again or recommend. F08
Evidence. A randomized trial (n = 682) found that adding a milder final interval made a medical procedure remembered as less unpleasant; a meta-analysis of 174 effect sizes found a large peak-end effect on retrospective ratings (r about 0.58) and almost no effect of duration Evidence grade A. Robust evidence: replicated, peer-reviewed research..
How it plugs in. End onboarding on a success (a first result, a first published item), not on a form. Make the confirmation after paying feel like a win. Repair the ending of bad support cases. Design anniversaries and yearly recaps as peaks for veterans.
Watch-outs. Strongest for single, bounded episodes. Improve the ending honestly; never add steps to manage memory.
Sources
Memories of colonoscopy: a randomized trial · Redelmeier, Katz and Kahneman, Pain 104, 2003
Evidence grade A. Robust evidence: replicated, peer-reviewed research.Peak-end effects in retrospective evaluations (meta-analysis) · Alaybek et al., OBHDP 170, 2022
Evidence grade A. Robust evidence: replicated, peer-reviewed research.
Source IDs: F08
Book content is paraphrased, never quoted at length. Last verified October 24, 2026.
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