It's Smart to Know....

Who's Who Around the Office
Keep track of who's coming & going for safety's sake

Keep an eye on entrances.
Have a receptionist or security guard near doors to welcome guests. Closed-circuit cameras and intercom systems may also be used with locked entrances, so that personnel can identify visitors before allowing them in.

Keep a visitor's log.
When visitors arrive, have them sign in and note their time of arrival and who they're coming to visit. When they leave, make sure they log out and note what time they left.

Issue temporary badges to visitors.
Print brightly colored "VISITOR" stickers or badges for guests, so that they stand out. 

Don't let visitors wander the facility escorted.
Have an employee accompany them to their destination and make sure they are not forgotten.

Require employee ID badges.
If you company is large enough that every employee may not know everyone else, issue photo badges for employees and contractors, and require them for entrance, so workers are easily identified.