Most leaders have a clear view of how they come across. Many of them are partly wrong. 360-degree feedback, which gathers views from a manager, peers, direct reports and sometimes clients, helps close that gap by showing how a leader's behaviour is actually experienced.
Done well, it is one of the most useful development tools available. Done badly, it produces anxiety, guarded answers and a report that sits in a drawer.
Decide the purpose first
360 feedback works best for development. When results feed directly into pay or promotion decisions, raters tend to soften their answers or use the process to settle scores, and the leader becomes defensive. If you want to use 360 data in decisions, use it as one input among several and say so clearly at the start.
Five design choices
1. What to measure
Base the questionnaire on your leadership competencies, written as observable behaviours. Twenty to thirty items is enough. Each item should describe something a rater could have seen, such as "explains the reasons behind decisions" rather than "is a strategic thinker".