E.g. home page for an organization on a record for its newsletter. Federal documents GPO catalogs all versions of a publication using the single record approach whenever more than one version exists. Rather than create separate records, it is strongly recommended to accept GPO's cataloging. There are, of course, many government serials that exist only in electronic format, for which GPO does not use a singe-record technique. If library holdings change to only one format or the other, or has access to several electronic sites for one title, each field in the record has to be evaluated to determine which fields need to be stripped or changed.
Records can become very large and potentially confusing.
Inclusion in union lists and ILL practice is confusing. They can be simply deleted if one of the formats is discontinued or withdrawn. It is clearer which title can be used in ILL and union lists.