DDC Call Number Guide: From Class to Label

Choose the class in its disciplinary context

OCLC’s introduction explains that Dewey organizes knowledge by discipline. A topic can therefore appear in more than one part of the system depending on its treatment. Use an index term to investigate a candidate, then read the schedule context and applicable instructions before assigning it. See the DDC introduction.

On your worksheet, write a one-sentence description of what the resource actually covers. For example, “a staff exercise book on describing library materials” is a more useful starting point than the word “books.” This step makes it easier to explain why a candidate class fits or does not fit.

Assemble an illustrative label

Suppose the class has been independently reviewed and a library chooses 025.3 for a fictional cataloging workbook. Using the Besorio/Darwin example and title Cataloging practice workbook, the application’s three-digit DDC output is:

025.3
B556c
2026

The numeric class does not come from the surname. The author/title mark does not verify the subject. The year is supplied by the operator. Keeping those origins separate makes errors easier to locate: a wrong year needs a record check, while a wrong class needs subject review.

Preserve notation when moving data

Store class numbers as text in an export worksheet. A spreadsheet can silently change a value such as 020 to 20, destroying the notation you intended to print. Similarly, do not round a long decimal because a column is narrow; widen the column or inspect the underlying text.

Before importing a batch, compare one short class, one long decimal class, and one value with leading zeros against the source records. This simple sample tests the conversion path more effectively than looking only at a typical three-digit value.

Review local author and item marks

If your library uses title workmarks, decide how to differentiate works with the same title initial. The application’s first-character rule cannot settle that collision. Also check whether a new edition should retain a previously established mark; do not regenerate everything merely because a form makes it easy.

1. Verify the subject class against the cataloging source.
2. Compare the author/title mark with nearby records.
3. Check publication and item details against the item in hand.
4. Preview the stacked label and confirm the catalog display.
5. Print one test before processing the full batch.

Frequently asked questions

Can this tool assign a Dewey number from a title?

No. You supply the class number after reviewing the content and classification source.

Is a title workmark part of the Dewey class?

No. In this workflow it is a separate local filing addition.