Always let someone know where you'll be - whether it's coming in late, working late, going to the photocopier or mail room, going out to lunch or a meeting.
Be discreet. Don't advertise your social life or vacation plans and those of your co-workers to people visiting or calling your place of work.
Check the identity of any strangers who are in your office - ask whom they are visiting and if you can help them find that person. If this makes you uncomfortable, inform security or management about your suspicions.
If you bring personal items to work, such as a coffee pot, a radio, or a calculator, mark them with your name or initials and an identification number.
Keep your purse, wallet, keys, or other valuable items with you at all times or locked in a drawer or closet.
Report any broken or flickering lights, dimly lit corridors, doors that don't lock properly, or broken windows. Don't wait for someone else to do it.