Why do resources on the same topic have different classification numbers?
SCIS records are classified according to the Abridged Dewey Classification edition 14 and the Dewey Decimal Classification edition 22. Some of the numbers in these editions of Dewey have been extensively revised. The records you are ordering now may have different numbers to other resources in your library on the same topic. The revisions to the Dewey Decimal Classification system are ongoing and incorporate changes in each subject area as necessary. The Dewey home page has monthly lists of new and changed numbers. These monthly lists are monitored by the SCIS cataloguers and changes incorporated into the SCIS database as they occur.
