This International Standard establishes a system for numbering divisions and subdivisions in written
documents. It applies to all kinds of written documents, for example manuscripts, printed works, books,
journal articles, directions for use and standards.
Numbering of divisions and subdivisions in a written document is advocated if this
— clarifies the sequence, importance and interrelation of individual divisions and subdivisions;
— simplifies search and retrieval of certain passages in the text, and makes possible the citation of
single parts of the text;
— facilitates references within a written work.