Give Feedback, Not Instruction
Keep your criticism to your observations, and the impact they have. Don't try to fix the problem, just identify it.
Offer to help fix the problem, and to support the solution that the other person comes up with. Unless you know how to do the work your coworker is doing, don't try to solve it for them—they'll ignore your feedback and you.
Thinker. Hipster-friendly coffee advocate. Infuriatingly humble organizer.
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