What is a duplex-numeric system?

What is a duplex-numeric system?

• A. It uses a single code number only.
• B. It uses two or more sets of code numbers with separators; first number then second, etc.
• C. It uses decimal categories only.
• D. It does not support sequential filing.

Answer: (B)

A duplex-numeric system uses two or more sets of code numbers that are separated by a delimiter. The first number identifies a broad category or group, and the second (and any additional) numbers specify a subcategory or the exact item within that group. This structure lets you see both levels of organization at a glance and makes it easier to file, sort, and retrieve records. For example, a file code like 12-34 means group 12 and item 34 within that group, with room to add more levels if needed. It’s different from using a single code number, and it doesn’t imply you can’t have a sequential order within each subset.

A duplex-numeric system uses two or more sets of code numbers that are separated by a delimiter. The first number identifies a broad category or group, and the second (and any additional) numbers specify a subcategory or the exact item within that group. This structure lets you see both levels of organization at a glance and makes it easier to file, sort, and retrieve records. For example, a file code like 12-34 means group 12 and item 34 within that group, with room to add more levels if needed. It’s different from using a single code number, and it doesn’t imply you can’t have a sequential order within each subset.