A manager sees somewhere between 10% and 20% of what one of their people actually does. Everything else happens in meetings they are not in, in threads they do not read, and in the handoffs between teams. Performance management built only on the manager’s view is therefore built on a sample, and not a random one.
What colleagues see that a manager does not
Teammates see collaboration and reliability, whether someone answers when it is inconvenient. Cross-functional partners see communication and follow-through, whether what was promised arrived. Junior colleagues see mentoring, which almost nobody else observes. More senior colleagues see strategic thinking. None of these are visible from a manager’s calendar.
It also matters that manager-only ratings correlate between 0.3 and 0.5 with actual job performance, which is better than nothing and much worse than most review cycles assume.
Peer feedback comes in four shapes: tied to a project, given in real time as things happen, collected formally in a 360, or simply requested by the person who wants to know.
How to put it in place
The foundation comes first, and it is not a process question. If people are not safe saying an inconvenient thing, the feedback will be polite and useless. Leaders asking for feedback about themselves, publicly and without flinching, does more here than any amount of training.
Then the design: when it happens, who is asked, in what form, and about what. Then the training, which is short and specific. Givers learn to describe a behaviour instead of labelling a person. Receivers learn to listen without defending, which is harder and matters more.
Quality is the part that decays first. Feedback that is specific, actionable, timely and balanced is useful; the rest is noise that teaches people to ignore the whole system. And then you close the loop: an action plan, a follow-up, and a thank you to the person who took the risk of being honest.
The three problems you will hit
Friends rate friends generously, which is fixed by framing the whole thing as development rather than judgement. People trade favourable reviews, which is fixed by confidentiality. And everyone drowns in requests, which is fixed by making the form short enough that answering it is not a favour.
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