The less capable we are, the less we are aware of it. Thus, people around you would benefit from you alerting them of their poor performance. Effective feedback should show the difference between how we see ourselves and how others see us. Ineffective feedback only tells what we already know.
It is a matter of course that positive feedback is shared more easily. Criticism is, however, actually more useful. If we don't know what we are doing wrong, we have no motivation to change it. Companies should focus more on providing negative feedback and train managers how to do it effectively.
The feedback provided by managers should be based on empirically measurable performance data. One of the most effective ways to improve on-the-job performance is to provide feedback and coaching based on the results of 360-degree feedback.
Data itself is not enough. Feedback should not be merely descriptive (eg. "You have problems with setting priorities."). It should explain behaviors based on specific examples (e.g., when there was a poor choice of priorities, what the consequences were and how it can be avoided next time).
When sharing feedback, it is not your communication style that is important, but the recipient's reaction to your feedback. The way they accept your feedback is strongly dependent on their personalities. Managers should be know their people well and adapt their communication style to their listener's personality characteristics.
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Article source Harvard Business Review - flagship magazine of Harvard Business School