Scope note: This class comprises works that are, or have been, planned to result in sequences of manifestations with common features. Whereas a work can acquire new members over the time it evolves Expressions and Manifestations are identified with a certain state achieved at a particular point in time. Therefore there is in general no single expression or manifestation representing a complete serial work, unless the serial work is ended. Serial Works may or may not have a plan for an overall expression. The retrospective reprinting of all issues of a Serial Work at once, in the form of a monograph, is regarded to be another member of a Complex Work, which contains the Serial Work and the Individual Work realised in the monograph. This does not make the monograph part of the Serial Work. Examples: - The periodical entitled ‘The UNESCO Courier’, ISSN ‘0041-5278’ - The periodical entitled ‘Courrier de l’UNESCO’, ISSN ‘0304-3118’ [French edition of the periodical titled ‘The UNESCO Courier’, ISSN ‘0041-5278’] - The series entitled ‘L’évolution de l’humanité’, ISSN ‘0755-1843’ [a monograph series comprising volumes that were published from 1920 on, and some of which were reprinted, with different physical features and rearranged in a different order, from 1968 on, in a distinct series also entitled ‘L’évolution de l’humanité’, ISSN ‘0755-1770’]