Hi Ben, Let me give a bit more detail to the issue. In United States cataloging land it is standard practice to create a single MARC record that describes a multi-volume "set". For example: *The handbook of family psychology and therapy* is a two volume set with just one MARC record. On that MARC record there are two ISBNs: 9780256034875 (v. 1) and 9780256034882 (v. 2) that identify the individual volumes and which could be directly related to the Evergreen Copy/Item Records. Volume 1 costs $50 and volume 2 costs $65. Now in this example there are only 2 volumes and the ISBNs for all of the volumes in the set are accounted for on the MARC record, but there are other titles where volumes never get all of their ISBNs added. This is particularly true in the case of a Serial/Periodical title that has an ISSN that describes the set, but also includes an ISBN on each new issue published. Also it is standard practice for a single MARC bibliographic record to describe a monograph that includes both a hardback and a paperback edition. Example: *Your defiant teen* 9781593855833 (pbk. : alk. paper) 9781593855840 (hardcover : alk. paper) In this example our library has both the hardback and the paperback but nothing on the Copy/Item record indicates that fact. "So what", you say ;-) There are two issues. The first has to do with acquisitions. When a MARC record has an ISBN for a "set", we can easily order from a vendor using that ISBN and get all of the volumes. However when the MARC record only lists ISBNs for each individual volume, it creates a problem. It is not uncommon for us to receive multiple copies of Volume 1 of a set because currently what gets ordered is derived from the first ISBN listed on the MARC record. If ISBN numbers could be attached to each item record, and those numbers used to create the order record, the problem would be solved. Second, in the case of hardback/paperback, lets say a copy of *Your defiant teen* is lost by a patron. We want to charge them for a replacement copy, but have no way of knowing if we should charge them a hardback price or a paperback price. I hope that all makes sense. Please feel free to contact me for even more details. Blessings, Don On Wed, Nov 6, 2013 at 2:55 PM, Ben Shum