The most fundamental rule of feedback says praise publicly, but criticize in private. However, there are cases when it is necessary to discuss performance issues with an entire work group even if it makes some people annoyed.
Although this may seem strange, you should always ask your subordinates whether you can share your criticism. They will then listen to you more carefully when you start speaking about the issue.
You can never know the real reasons why employees start behaving, as you see it, in an unacceptable way. The facts on the surface are not enough. Always let them explain the situation from their perspective.
Explaining the positives employees may achieve when they improve is more effective than only saying what they are doing wrong.
Do not assume that the employees being criticized can deduce by themselves how exactly you want them to change their behavior.
If you are going to have a really serious critical discussion, count on the fact that the employee will need some time to absorb your criticism. You may, for example, consider giving him an afternoon off. Giving someone space is much better than inventing false compliments to dilute your criticism.
Keep in mind what you want to say to the employee and what kind of relationship you want to maintain. You can't control others' reactions, but you can control your own.
Research shows that although most managers do not like to criticize, most employees want to hear criticism. Studies of effective teams and happily married couples show that the ideal ratio between praise and criticism is five compliments to every piece of criticism.
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Article source Harvard Business Review - flagship magazine of Harvard Business School