Why you should always under-promise and over-deliver

The article argues that promises are a social norm tied to obligation, trust, and reduced uncertainty. When expectations are met or exceeded, people feel better; when promises are broken, trust drops and the relationship changes.

It also says the brain registers the conflict of an unkept promise before people admit it to themselves, and that broken promises can lead to stress, guilt, punishment, and revenge. The practical advice is to question whether a promise is necessary, under-promise by estimating more time than you think you need, and apologize quickly if you cannot keep it.

Reading notes

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• Promises help create obligation, regulate behavior, reduce uncertainty, and build trust.
• Big promises create big expectations, and unmet expectations lower dopamine production.
• Keeping or exceeding a promise signals trustworthiness and supports relationships.
• A broken promise can feel like a debt and can lead people to want punishment or revenge.
• The brain can register emotional conflict before a person admits they will break a promise.
• Before making a promise, it helps to ask whether it is necessary and whether a smaller promise would work better.
• Estimating more time than you think you need gives room to finish without failing the commitment.
• If a promise cannot be kept, the article advises giving a direct reason, an apology, and a solution.