Many LibraryData reports display title-level data in broken out by ISBN clusters. This differs from SalesData, which reports data at a per-ISBN level. This page will help you understand why ISBN Clusters are used, and answer some common questions about ISBN clusters!
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For example, if we're looking at the cluster for Pride and Prejudice, you can see that libraries 1, 2, and 3 each have different ISBNs in their record. Library 1 has one ISBN in common with Library 2, and Library 2 has one ISBN in common with Library 3. Those common ISBNs are used to create the ALL Libraries ISBN cluster for this title, pulling in all of the ISBNs from these three library records. As additional libraries join the ALL Libraries Panel, the ALL Libraries ISBN cluster will grow based on the common ISBNs in the libraries' records.
| Library 1 | Library 2 | Library 3 | ALL Libraries |
|---|---|---|---|
| 9780141199078 | 9780141439518 | 9780141439518 | 9780141439518 |
| 9780755331468 | 9780679783268 | 9780679783268 | |
| 9781593083243 | 9780141199078 | ||
| 9781904633013 | 9780755331468 | ||
| 9781551110288 | 9781593083243 | ||
| 9780679783268 | 9781904633013 | ||
| 9780679601685 | 9781551110288 | ||
| 9780679405429 | 9780679601685 | ||
| 9780307290922 | 9780679405429 | ||
| 9781853268335 | 9780307290922 | ||
| 9781853268335 |
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Do you have more questions about ISBN clusters? Email us at librarydata@booknetcanada.ca for help!