032Effect
Peak-end Rule
People tend to overvalue both the peak of an experience, and the end.
Why it matters
As an example, f you are reviewing a theatre show, you'll disproportionately associate value to both the best/worst bits (peaks), and the very end of the performance.
Sharing & referrals:
• People are more likely to refer your product, if they've just experienced a peak (in value), or if the end of the process was particularly easy. • e.g., " you should sign up to BeepBoop, the form is pretty easy " — this is likely influenced by how "easy" the end of the process was, not an evaluation of the entire thing.
What to inspect
- Check whether the experience reflects this: People are more likely to refer your product, if they've just experienced a peak (in value), or if the end of the process was particularly easy.
- Map each visible element to how it supports or undermines: People tend to overvalue both the peak of an experience, and the end.
- Walk the primary task once with time pressure; note where attention drops.
- Ask a colleague unfamiliar with the product to paraphrase the screen in one sentence.
Common anti-patterns
- Assuming users consciously notice every place where "People tend to overvalue both the peak of an experience, and the end" could apply.
- Dense copy and parallel actions that increase mental effort unrelated to the user’s goal.
- Ignoring downstream effects on sharing and referrals when shipping this pattern.
Critique prompts
- People are more likely to refer your product, if they've just experienced a peak (in value), or if the end of the process was particularly easy.
- Where on this screen would "Peak-end Rule" show up as friction or misunderstanding?
- What would a first-time user misunderstand here in under five seconds?