A promise of quality should include what happens when the ordinary result falls short.

Anyone can promise a good outcome on a good day. What tells you about a maker, a service, or a professional is the part of the promise covering the ordinary failure: the replacement, the return, the second attempt, who pays for the fix. Without that, quality is only a claim about intentions.

When you make a promise, say what you will do if it does not hold. When you are buying, ask that question before the money moves rather than afterward. Vagueness about the failure case is itself a piece of information.