How to Give Constructive Criticism as a Boss
If you only tell people what they're doing wrong, then at some point, they'll probably start tuning out everything you say.
Being a boss is not about acting like a drill sergeant or a no-nonsense (vaguely abusive) college football coach. It's not about yelling at people, nor is it about correcting their mistakes. Those tactics may work in the short term, but they create a toxic environment with a very low ceiling for improvement.
Great bosses help their employees get better by giving them feedback that shows them a path to improvement while also demonstrating that they are valued for what they do well. Of course, mistakes need to be addressed, and some problems -- those that involve safety concerns, or poor handling of customer-facing issues, for example -- demand harsher, more immediate solutions. But most don't.
Source: Fool.com