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Overview of Changes in Dewey Decimal Classification 23: Key Updates and Recommendations

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zelda
17 diapositives · 323 Views · Oct 15, 2014

Dewey Decimal Classification (DDC) 23 introduces numerous small updates primarily focused on enhancing precision in numbering. While many revisions have been integrated into WebDewey 22, users must exercise caution when referencing numbers from older records, especially Dewey 22. Key updates include repositioning of topics, modified number scopes, and the introduction of new "add tables." DDC 23 also reflects a removal of obsolete numbers and provides new historical period classifications for various regions. Always verify numbers and review scope notes for accuracy.

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Overview of Changes in Dewey Decimal Classification 23: Key Updates and Recommendations
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  1. Dewey 23 An overview of the changes

  2. Logging onto WebDewey 23

  3. Dewey 23 • Many small ‘tweaks’ to numbers, rather than major areas of change • Many of these small changes have already been incorporated into WebDewey 22 • Take great care when using numbers taken from other records, especially if these are Dewey 22 rather than 23. Always check numbers, rather than assuming that a number is correct

  4. Example of change already added to WebDewey 22 (but not in the print manuals)

  5. Main kinds of change • Topic moved to a new number • Changes to the scope of a number • New “add tables” • Changes to both scope and number • New historical periods

  6. Topic shifted to a new number

  7. Change to the scope of a number

  8. New Add Tables • “Add tables” are lists of special notation that can be added to a base number to make it more specific. Dewey 23 contains some new add tables • For example, there is a new add table at 155 Differential and developmental psychology

  9. Top 20 Teens: Discovering the Best-Kept Thinking, Learning & Communicating Secrets of Successful Teenagers.

  10. Top 20 Teens … • Class at: 155.51/9 Applied psychology for young people twelve to twenty • The breakdown is: 155.51 General topics of psychology of young people twelve to twenty plus 9 Applied psychology from the add table at 155 • In Dewey 22, you do not have the option of adding 9 for “Applied psychology” so your number would just have been 155.51

  11. Number moved and scope updated

  12. Numbers that just don’t exist any more • 721[.046] Architecture and the environment, multiple-purpose buildings • Both the subordinate topics “Architecture and the environment’ & “Multipurpose buildings” have been moved elsewhere – so there is now no purpose for 721.046 and it has been removed

  13. New historical period numbers added

  14. Some areas where there have been many small changes • 320s - Politics • 363-363 - Social problems and services • 808s – Collections of literary texts from more than 2 literatures • Historical period numbers for Italy and SouthEast Asia • New historical period numbers added for many countries

  15. Summary • Many small differences • Ability to create more precise numbers (in some cases) • Always check numbers, and read scope notes carefully