Changes to a serial resource may be Major or Minor. Major Changes usually require a new description for the resource. Minor changes will not require a new description but will necessitate revising the existing description in some way in most situations.
What constitutes a Major Change has been established by RDA and adopted by CONSER.
Changes to the following elements or areas may constitute a major change depending on the situation.
The title proper
Authorized Access Point representing a corporate body when used in conjunction with the Preferred Title representing a work to construct an authorized access point ($130 qualifier).
Corporate body when used as an addition to the authorized access point representing a work
Preferred Title for different language expressions
Edition statement
Mode of issuance (RDA 1.6.2.1