The Bliss Bibliographic Classification Association is an association of users and supporters of the Bibliographic Classification. The association promotes the development and use of classification, publishes official amendments, enables users to keep in touch and exchange experience, and gives them a say in the future of the scheme. It is a nonprofit organization, founded in 1969, with members all over the world. Each of the following schedules is the result of a rigorous and detailed analysis of the terminology of the field in question, using the techniques of facet analysis.