If someone is doing things wrong, don't accumulate a list offences for one massive criticism frenzy. Regularly let them know about mistakes so feedback becomes part of the routine.
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People are more likely to want to hear negative feedback than feel like giving it. So schedule a weekly check-in with your colleagues or team where you appraise them of what's going wrong, says Ethan Rasiel, CEO of Lightspeed Public Relations:
Often managers save up criticism for weeks or months and then pour it out all at once. It's better to provide feedback — positive and negative — in real time," he says. By giving regular feedback, you'll become more comfortable giving it, and your team will be more prepared to receive it.
It's an uncomfortable situation, but knowing how to give criticism and when to do it can help make your life smoother. By making it a part of regular routine, you take the pain and negativity away from it.
How To Master The Art Of Giving Negative Feedback [Fast Company]