When you ask for feedback frequently, people around you will get used to it and feel less uncomfortable when talking about what you could improve. Ask about specific situations, such as: "What could I do better next time on a meeting like the one we had yesterday?"
First of all you should listen. Thank everyone who is willing to share opinions with you and listen to what is said. Once you begin to defend or advocate for yourself, the person will stop being honest and turn polite again. Write the feedback down so that you can refer to it later, this way the other party will see that feedback is really important to you.
What is your recipe for getting honest feedback?
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Article source Harvard Business Review - flagship magazine of Harvard Business School