Notice when the peak or end of an experience is dominating your memory of it

Your memory of an experience is shaped by its peak intensity and how it ended — not by its total duration.

Why it works

The peak-end rule (Kahneman and colleagues) is a specific form of scope insensitivity: the brain summarizes an experience by its peak emotional intensity and its final moments, discarding duration almost entirely. This means a longer version of a bad experience is not remembered as worse if it ends with lower intensity than a shorter version with a bad ending. The rule has direct consequences for how you evaluate past choices and design future ones.

How to do it

1. After any extended experience, notice: "Is my overall rating being dominated by the peak moment and the ending?"
2. Deliberately reconstruct the full duration: "What was the average quality, not just the best and last parts?"
3. When designing an experience (presentation, event, conversation), invest in the ending as a disproportionately impactful element.

Evidence

The peak-end rule has direct experimental support from Kahneman and colleagues, including studies on medical procedures (colonoscopy) where a less painful ending reduced remembered pain even though total pain was greater. (rct)

Sources

• Redelmeier & Kahneman (1996), patients’ memories of painful medical treatments — peak and end determine remembered pain, Pain
• Kahneman, Fredrickson et al. (1993), "When More Pain Is Preferred to Less," Psychological Science

Common mistake

Redesigning an ending to be positive while leaving the rest of the experience unaddressed — the ending adjustment only fixes remembered evaluation, not the experience itself.