Short answer
A Single Source of Truth is the central principle of structured authoring. Information such as a safety warning, a procedure, or a specification is written once, stored in one place, and reused by reference.
This avoids copy-paste, divergent versions, and manual updates across multiple files. When the source changes, the correction can be propagated across the documentation corpus.
In Calenco, the Single Source of Truth applies to content modules, variants, translations, and publications. It improves consistency, reduces errors, and makes technical documents easier to maintain across multiple formats.
Single Source of Truthstructured authoringtechnical documentationCalenco