Linked from
The 12 pages that link to Controlled vocabulary, each with the reason it gives.
MetadataRelated: Controlled terms reduce variation in descriptive metadata.
Library classificationRelated: Controlled terms can complement class marks in subject access.
CatalogingRelated: Shared terms make subject description more consistent and retrievable.
GlossaryRelated: A controlled vocabulary helps keep glossary headwords and definitions consistent.