Work etiquette is key to maintaining a pleasant and effective office. All workplaces are different, but basic work etiquette is pretty universal within a country. (Of course, once you start doing business with people from other countries, you might want to brush up on their etiquette rules. For example, in China it’s considered rude if you don’t take a business card with both hands.)

So for those of you doing business in the US, here are 15 basic work etiquette tips for making your professional life enjoyable.

1. Put your phone on silent

Cell phones going off in the middle of a meeting? Never good. Put your phone on silent. If you find you’re still tempted to look at it, consider leaving your cell at your desk before the meeting.

2. Respect others’ space

Cubicles don’t make for much of a sound or smell barrier, so be mindful of those around you. Don’t eat at your desk if you can help it, and try to speak in a lower voice when on the phone.

3. Show up on time

Sometimes it’s hard to get out of bed and get going—we’ve all been there. But that doesn’t mean that it’s a valid excuse for being late to work. It won’t be the end of the world if you don’t make it on time, but don’t make it a habit. Being late makes you seem unprofessional.

4. Don’t stray off topic

When speaking to people in a work setting, try to limit yourself to work topics. This is not the time to start talking about your latest vacation, your new dog, or your family. Keep all conversations about work only. If you’re friends with your coworkers, use your lunch break to talk about non work-related topics.

5. Dress appropriately

If your work is business casual, that’s what you should be wearing. If something requires you to wear a three piece suit, make sure you show up wearing one. Appropriate clothing is key to maintaining professionalism.

6. Respect workplace boundaries

It’s great if you’re friends with your boss, but don’t take it too far. Being friendly is a lot different than expecting preferential treatment. Keep it professional and try to separate your work relationships from your personal ones (even if they’re with the same person).

7. Introduce yourself using your first and last names

In some settings, it’s fine to just introduce yourself by your first name. But in business settings, you should always introduce yourself by your first and last names. After all, you want people to know who you are.

8. Know what you’re going to say

“Um” and “Uh” have no place in the office. Whether you’re talking to a colleague or speaking to a potential client, try to keep the stammering to a minimum. Saying “um” a lot implies that you don’t really know what you’re talking about and are stalling for time.

9. Eat your own food

This is a problem in many communal settings, from college dorms to corporate office buildings. If you didn’t bring it, or if it doesn’t have a sign that’s telling you to help yourself, leave it alone.