From Elsmar Cove Quality Assurance and Business Standards Wiki
A document that is subject to controls that prevent the unintended use of defective versions of it.
The controls generally include methods to approve, review, update, identify changes, annotate revision status, distribute, and maintain documents, and to prevent the use of obsolete versions of these documents.
The controls also include methods to identify and distribute documents of external origin that are necessary for the planning and operation of the quality management system.
See also:Controlled document thread in forums