Here’s a workplace rule we all know, but sometimes forget: Don’t Assume They’ll Just Tell You That There’s a Problem.

Whenever I deliver any kind of seminar, whether it’s about communication, business etiquette, or anything else for that matter, there are always a couple of cranky folks in the audience who provide the same feedback: “I don’t need this! I’m fine! I would never show up to work wearing or doing anything unprofessional.” And then, they add the punch line: “And, if there ever was a problem with any of this stuff, I’m sure my boss would just tell me.”

Think again, my friend. If you think it’s hard to get feedback, just try giving some. Personally, I think it would be easier to do calculus all day than have to tell someone at lunch that they’ve got spinach caught between their teeth. As great as your boss might be, don’t assume that you’re getting all of the feedback that you need to get ahead on the job.

What does this mean for you? Unless some kind soul is willing to enlighten you, you often don’t really know if there is an issue with your dress, manner, communication style – or anything else, for that matter. And as a result, you don’t even know that you’re making mistakes in the first place.

Plus, we never imagine that we could be the ones with the problem. We never think that we’re the cocky ones, the annoying ones, the ones who are anything less than fabulous. Whether it’s talking too loudly on your cell phone or hogging up the left lane on the highway, the reality is that we’re clueless about our own deficiencies.

What’s the moral of the story? If you want some feedback, you’ve got to ask for it.

Even if you’re convinced you’re sheer perfection on the job, do yourself a favor and check in from time to time. For instance, if you’ve got a client meeting coming up, there is nothing wrong with touching base with your boss about a couple of the details: “Jane, I’m thinking of wearing this to our client meeting next week. Is this OK?” When it comes to important emails, ask a trusted colleague to take a look before you hit the send button. Not only will they catch mistakes that you may have missed, but they’ll also be able to judge the message for content and ideas, and give it a general thumbs-up – or not.

The key here is to seek out feedback and ask for it – don’t assume that it will come to you. Warning: Don’t go overboard here. Periodic feedback is great. Asking for your boss’s opinion on every email you write will only drive the both of you crazy.