ISSNjärjestelmä

ISSNjärjestelmä, or the International Standard Serial Number system, is a unique identifier used to identify periodical publications such as journals, magazines, and newspapers. It is a numeric code consisting of eight digits, which is assigned by the International Organization for Standardization (ISO) and the International Agency for Information and Documentation (IAID). The ISSN is used to track the publication history of a periodical, including its title changes, mergers, and splits.

The ISSN system was first introduced in 1975, and it has since become an essential tool for librarians, publishers, and researchers. The ISSN is typically found on the title page of a periodical, along with other identifying information such as the publisher's name and address. It is also used in bibliographic databases and catalogs to facilitate the retrieval of information about periodicals.

The ISSN system is organized into two parts: the first part, which consists of the first four digits, identifies the publisher or the publishing group, while the second part, which consists of the last four digits, identifies the specific periodical. The first four digits are assigned by the ISO and the IAID, while the last four digits are assigned by the publisher.

In addition to its use in identifying periodicals, the ISSN system is also used to track the circulation of periodicals. The ISSN is used to report on the number of copies distributed, which is used to determine the periodical's impact and influence. This information is used by publishers, librarians, and researchers to make informed decisions about the acquisition and retention of periodicals.

In summary, the ISSNjärjestelmä is a unique identifier used to identify and track periodical publications. It is an essential tool for librarians, publishers, and researchers, and it plays a crucial role in the dissemination and retrieval of information.