Which term refers to broad categories within the Dewey Decimal system?

• A. Main Classes of DDC
• B. Recreational Reading
• C. Mobility Aids
• D. Genre-Based Organization

Answer: (A)

Top-level organization in the Dewey Decimal System is into ten broad groups called the Main Classes. These are the broad categories that group knowledge at a high level, and every specific topic gets placed under one of these main classes before being divided into more detailed divisions and sections. For example, topics on science sit under the Science main class, while literature falls under the Literature main class, and so on. This top-level naming helps librarians see the general subject area at a glance and then narrow it down further.

The term for these broad categories is the Main Classes of DDC. The other options don’t reflect this official top-level structure: Recreational Reading isn’t a formal top-level category in the Dewey system, Mobility Aids aren’t related to how DDC is organized, and Genre-Based Organization describes a different way libraries sometimes group materials rather than the official Dewey framework.