Fairness is not a tone of voice. It is a shared set of facts that both people can see before the conversation begins.
Ask any HR leader what makes a performance conversation go badly and you will hear the same answer: surprise. Nobody responds well to feedback that appears to contradict the last twelve months of their experience.
Surprise is usually a memory problem. Feedback was given, but never connected to anything. Expectations shifted, but the shift was never recorded. Support was promised, but the promise dissolved into a busy quarter.
When both people can see the same history — what was agreed, when, and what happened next — the conversation changes character. It stops being a negotiation over the past and becomes a discussion about the future.
That is the outcome we care about. Not more documentation, but fewer conversations that begin with two incompatible versions of events.