Peak–End Rule

emerging Updated: 2026-06-02
ux-design design-principles heuristics peak-end-rule memory experience-design emotion

Peak–End Rule

Status: emerging
Last updated: 2026-06-02
Sources: Lawsofux.Pdf
Tags: [ux-design, design-principles, heuristics, peak-end-rule, memory, experience-design, emotion]

Summary

The Peak–End rule holds that people judge an experience largely by how they felt at its most intense moment (the peak) and at its end, rather than by the average or sum of every moment (Yablonski, 2024). Applied to UX, it directs designers to identify and strengthen the emotional high points of a journey and to ensure experiences end on a positive note, since those moments disproportionately shape what users remember and how they evaluate a product. Yablonski draws the principle from the work of Kahneman and colleagues on remembered experience.

Body

Context

Yablonski (2024), in the Peak–End Rule chapter of Laws of UX, applies findings on how people remember experiences to the design of user journeys. The chapter states the rule, grounds it in behavioural research, and shows how to locate and shape the moments that matter most. Within this knowledge base the article connects to Usability And User Experience (overall experience evaluation) and to the memory constructs in Working Memory Capacity; it is one of the experience laws in Laws Of Ux.

Key Points

Yablonski states the rule as: people judge an experience largely based on how they felt at its peak and at its end, rather than on the total sum or average of every moment (PDF pp. 85–96, orig. pp. 65–76). He attributes the principle to Kahneman and colleagues' research on the difference between experienced and remembered utility.

The design implication is to manage the emotional shape of a journey. Because peaks and endings dominate memory, designers should pay close attention to these critical moments — strengthening positive peaks (moments of delight, accomplishment, or unlock) and ensuring the experience closes well (PDF pp. 85–96, orig. pp. 65–76). The chapter also notes that setbacks can be turned into opportunities if handled with the right recovery, since how a low point is resolved contributes to the remembered experience.

Conclusion

Yablonski (2024) concludes that not all moments in an experience count equally to the user: the peak and the end carry disproportionate weight in memory and judgement, so design effort is best concentrated there. Engineering memorable highs and positive endings shapes how the whole experience is recalled.

References

Yablonski, J. (2024) Laws of UX: Using Psychology to Design Better Products & Services. 2nd edn. Sebastopol, CA: O'Reilly Media. yablonski2024lawsux

Kahneman, D., Fredrickson, B.L., Schreiber, C.A. & Redelmeier, D.A. (1993) 'When more pain is preferred to less: Adding a better end', Psychological Science, 4(6), pp. 401–405. To be validated.

Open Questions

  • How reliably do peak and end effects transfer from episodic laboratory experiences to long-running, multi-session product use?
  • How should designers identify the actual emotional peak of a journey rather than assuming where it lies?