Listing Things the Company Should Be Doing Differently
If your boss asks for this kind of feedback, by all means give it to her — tactfully and constructively, of course. And scheduling a meeting with your boss to discuss concerns is valid, too. But offhanded criticisms of the company with no real solutions behind them will only serve to make you look unprofessional and uncommitted.
Giving an Ultimatum
Threatening to leave if you don't get that raise or promotion may seem like a great bargaining chip, but this move is more likely to backfire than not. Your boss may tell you that what you're asking for simply isn't possible, in which case you're forced to either follow through with your threat or eat crow.
Oversharing About Your Personal Life
Letting your boss in on some of the details of your personal life is a wise decision — it makes for a more comfortable work environment and may make her more understanding of your personal commitments. But don't overdo it; your boss doesn't need to know that you’re exhausted because you were up late fighting with your boyfriend, or that your hangover is making you unproductive. Too much information is unprofessional and can start to sound like made-up excuses.