Consider as a major change in title proper creating a new serial title of a serial expression the addition, deletion, change, or reordering of any of the first five words (the first six words if the title begins with an article) unless the change belongs to one or more of the categories of minor title change listed below. Consider also as a major change the addition, deletion, or change of any word after the first five words (the first six words if the title begins with an article) that changes the meaning of the title or indicates a different subject matter. Also consider as a major change in title proper a change in a corporate body name given anywhere in the title if it is a different corporate body. Also consider that there has been a major change if there is evidence that the publisher intentionally changed the title; such evidence may include, for example, a statement by the publisher or a new ISSN printed on the publication. Also consider that change from a title word indicating one type of resource to a title word representing another (such as a change from "magazine" to "journal") is a major change.
In the case of a major title change, treat the change as if it created a new serial title of the same expression of the same work with a sequential relationship to previous serial titles of that expression. Serials do not have content in the same way that monographic resources do. Serials are essentially hollow shells containing other works. In the case of serial titles, the various serial titles should be conceptualized as being component parts that together make up the entire expression (rather than as being copies of the expression content that vary in marks of identification), since the underlying content changes with every issue.