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Why is it that the same WorldCat search performed on and then on FirstSearch produces different results?

Applies to

The default order of results differs between the interface and the FirstSearch interface. Results are displayed according to relevance in, so the items most closely related to a user's search terms will appear at the top of the results. In the FirstSearch view of WorldCat, results are displayed according to the number of holdings for each item. Therefore, items that are owned by the most WorldCat libraries will appear at the top of the results.

In addition, results cluster related editions and formats under a representative record, while FirstSearch results display a separate record for each edition or format.

As with major search engines, results for the same search on may vary over time, as the WorldCat database grows and OCLC improves its supporting algorithms.

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