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Peak-End Rule

The Peak-End Rule (Kahneman) for product experiences. Why people remember experiences by the peak emotional moment and the ending — not the average. How to design both deliberately.

Primary source

Daniel Kahneman, Barbara Fredrickson, Charles Schreiber & Donald Redelmeier, 1993. Replicated in dozens of contexts — pain, vacations, product experiences, customer service.

What it is

People remember experiences not by averaging across them, but by the peak emotional moment plus the ending. The middle is largely forgotten. A great experience with a bad ending is remembered as bad. A mostly-mediocre experience with a great ending is remembered as good.

When to use it

Onboarding (the first complete-experience moment is the peak). Free trials (the last day shapes the renewal decision). Customer service interactions. Post-purchase confirmation screens.

How I actually apply it

I look for the peak moment in the user journey and ask whether it's been designed for. I look for the ending and ask whether it lands. If either is just functional rather than memorable, that's the highest-leverage change on the page.

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