TS 1212 ISO 2145

TS 1212 ISO 2145 is a documentation standard concerned with how divisions and subdivisions are numbered in written documents. It addresses the visible structure of a text rather than its subject matter, helping technical reports, manuals, policy-like documents and institutional publications present their sections in a consistent, easy-to-follow order. In practical terms, it defines a numbering scheme for the logical hierarchy of a document.

Why numbered structure matters

In general technical documentation practice, section numbering is one of the main ways to distinguish major topics, subtopics and finer levels of detail. It makes long documents easier to navigate, supports references to specific parts, and helps preserve a stable structure across revisions or different editions. In documents with several levels of headings, a clear numbering system also makes the relationship between ideas more transparent to readers.

What this standard covers

This standard covers the numbering of divisions and subdivisions in written documents. In other words, it provides a common framework for marking headings and nested subheadings so that the document’s hierarchy can be shown consistently. That consistency is especially useful where the same structural logic needs to be understood quickly across different types of written material.

• Numbering of main sections and lower-level subsections
• Clear display of document hierarchy
• A consistent reference structure for headings
• Easier searching, citation and cross-referencing in technical and organisational writing