Alphabetical Colour Coding . .
Code 2 or 3 letters. First 2 letters of last name. Add the first letter of the first name to break up large last name folder groupings.

Alpha-Numeric Colour Coding . .
Folders are filed in alphabetical sequence. A numerical sequence is added within the alphabetical section. Notice the misfile...

Straight Numeric Colour Coding . .
All files are numbered and filed in numerical sequence (12345, 12346, 12347, etc.) Using double digit labels instead of two single labels for the last two digits can also save coding space and money.

Terminal Digit Colour Coding . .
Large, active systems using colour code folders (25,000 folders or more) are filed by 100 section groupings, then by two digit colour code groupings. EXAMPLE: The last two (45), the middle two (23) and the first two (01). The file system grows and reduces equally in 100 places...