The Peak-End Rule: Customers Remember the High Point and the Finish

People judge an experience by its high point and its end, not its average

The peak-end rule describes a tendency: when people look back on an experience, they weigh the most intense moment (the peak) and the final moments more heavily than the whole. For anyone who sells a service, it suggests where to put effort first: the high point and the ending, before you polish every minute in between.

The finding comes from the work of psychologist Daniel Kahneman and his colleagues.

What the studies showed

In 1993, Kahneman, Barbara Fredrickson, and coauthors published a cold-water experiment. Participants held a hand in cold water for 60 seconds. In a second trial they held it in for 60 seconds, then 30 more seconds while the water warmed slightly but stayed uncomfortable. Asked which trial to repeat, most chose the longer one. It contained more discomfort, but it ended a little better.

Another well-known study, by Donald Redelmeier and Kahneman (1996), followed patients undergoing colonoscopy. Patients rated pain during the procedure and then gave an overall rating afterward. The overall rating tracked the worst moment and the final moments more closely than it tracked how long the procedure lasted. This neglect of duration is a companion finding.

There are limits. Most of the experiments involve short episodes of pain or discomfort. Whether the effect is as strong for long purchases or services with many touchpoints varies by situation. It is better treated as a tendency than as a law.

Building a high point

In a service, a peak is usually a moment of strong feeling:

• The first time the customer sees a result, such as the first delivery
• The moment a problem is solved
• A response that is kinder than they expected

You cannot make every moment lavish. Pick the scene where the customer is most anxious and the scene where they are happiest, and put your effort there. For an anxious moment, explaining the process in advance or sending a progress note often helps.

Designing the ending

The ending is the part you can most easily control. After delivery, you might:

• Hand over instructions and a contact for questions together with the work
• Make billing and contract steps clear and quick to finish
• Check in a few days later to ask whether anything is wrong

Weak endings look like this: contact stops after delivery, canceling is confusing, or the invoice shows a charge the customer did not expect. Even good work can be remembered poorly because of how it closed.

Polishing the ending is not a way to cover a weak service, though. If the substance is poor, a nice finish will not repair trust.

Avoiding a bad peak and a bad ending

A peak is not always a good moment. Strong frustration or worry can also become the moment people remember: an error on the sign-up page, or a reply that takes days to arrive. These can drag down the overall impression.

List the scenes where customers might get frustrated, and sign up yourself as a customer to see what happens in each. Where you cannot fix something, simply telling people ahead of time can change how it is received.

Endings a small company can afford

Many endings cost nothing. A delivery email can thank the customer and say what happens next, such as how long questions are welcome or when you will be in touch. A personal line helps. Put the contact for problems where it is easy to find. Small details like these form the last impression.

Then check how customers respond. The rule describes a tendency, and you will not know which touches suit your own customers until you ask them.

When you ask customers directly, two questions are enough: which moment stood out most, and how they felt at the end. Keep the questions short and easy to answer. Even a handful of replies may point to a high point different from the one you assumed.

What to do next

1. List every step a customer goes through, from first inquiry to the end.
2. Pick one anxious moment and one happy moment.
3. Add one piece of advance guidance at the anxious moment.
4. Look at how a project ends today, after delivery or at cancellation, and note the impression it leaves.
5. Choose one closing touch, such as a check-in message or a note on next steps, and use it on your next job.