1. Dress appropriately for the job, whether that's a business suit, uniform, or office casual. Take cues from your superiors, co-workers, and any company regulations as to what is acceptable. When in doubt, dress more conservatively/mainstream.
2. Respect those around you by keeping your voice and music at reasonable volumes, both on and off the telephone.
3. Don't engage in conversations about personal invitational events with co-workers in the presence of those who are not being invited. Don't discuss religious or political matters with co-workers, vendors, or clients unless the organization is of that particular faith or political leaning, and don't discuss really personal matters at all.
4. If your workplace has a kitchen/eating area, keep it clean-don't leave garbage around or put dirty dishes in the sink. Wash, dry, and put away used dishes or put them in the dishwasher if there is one, and throw the garbage in a trash can. Do not eat or drink in areas where this is designated off-limits.
5. Obey any rules and ordinances about not smoking in the office or only in designated smoking areas.
6. If office equipment like copiers, fax machines, and printers become jammed, need toner changes, or otherwise stop working, immediately notify the appropriate person, but don't attempt to fix the problem yourself unless you are the appropriate person (office manager, receptionist, admin, IT personnel, etc.).
7. Don't leave papers, paper clips, broken staples, etc. in the areas around copiers and fax machines-throw bad copies and broken staples in the garbage and keep the areas around copiers and fax machines clean.
8. Collect your papers as soon as you are through using a printer, copier, or fax machine-don't leave them in the machine, especially if they contain confidential information.
9. If your workplace allows you to circulate petitions or do fundraising, don't put pressure on your co-workers to support your causes. Let them decide whether or not to do it and how much they wish to participate or contribute.
10. Your co-workers are not there to babysit or entertain your children. Unless your company participates in a "Take your child to work" type occasion, make other arrangements for having your children babysat. If you do bring your child to the workplace for whatever reason, it is your job to keep your child under control and see that s/he obeys the rules of the workplace.
11. If you and your co-workers bring in food or drink to be shared by everyone, take no more than your fair share. If you are allowed to store foods in a communal refrigerator that are for your consumption alone, label yours and do not touch others'.
12. Don't use your office computer for unauthorized personal use, including Internet browsing and E-mail. Keep anything that could compromise your job off your computer.