Some people prefer a system that is strictly alphabetical using individual file folders.
While still others prefer to color-code their system to divide different areas of their lives. The same general principles apply for a workplace's filing system as well. Everything is in alphabetical order. This is one of the most useful things for efficient retrieval of files but which many people don't take the time or the effort to do. Keep these first two items on top of your workspace or in a very accessible location so you don't miss a critical date.