Rebecca -- Because there has been a major change in the key title (MARC 222, specifically the change of corporate body name), a new ISSN was assigned (and correspondingly a successive record was created when the corporate body main entry changed).

There are times when a successive record is created (and/or a new ISSN is assigned) even though the title proper doesn't change.  In terms of successive records, refer to AACR 21.3B.

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On Wed, 18 Jun 2008, Kemp, Rebecca wrote:

> Sorry if I'm overlooking something basic, but is there a reason that
> this title has two different ISSN in these two OCLC records: 1997797 and
> 6468892?
>
> Thanks,
> Rebecca