Let's face it, nobody likes hearing criticism. But sometimes you have to dish it out in order to find a solution to the problem. But if you're going to be the one to give feedback, keep it short in order to maximize its impact. Here's why:
Length doesn’t correlate to success when it comes to delivering negative feedback; long conversations confuse as often as they clarify. Your goal is to communicate the negative feedback, not to produce a dazzling epiphany, a heartfelt apology, or a ton of emotive dialogue. Once you’ve communicated your message, get out of the conversation, and allow time and space for the feedback to work.
Think about it. If you don't enjoy listening to someone's ad nauseum about your idea, then neither does the next person. Just let the input speak for itself and move on.

For more useful tips on how to deliver effective criticism, head over to Fast Company
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