Opus number developed other catalogue-number systems; among them the "Bach-Werke-Verzeichnis" (BWV-number), and the "Köchel-Verzeichnis" (K- and KV -numbers) with which are organised the works of Johann Sebastian Bach and Wolfgang Amadeus Mozart, respectively. In the classical period, the Latin word "opus" ("work", "labour") was used to identify, list, and catalogue a work of art. By the 15th and 16th centuries, the word "opus" was used by Italian composers to denote a specific musical composition, and by German composers for collections of music. In compositional practise, numbering musical works in chronological order dates from 17th century Italy, especially Venice. In common usage, the
A Catalogue of Books Printed in the Fifteenth Century now in the Bodleian Library 1992 to 1999, Jensen headed the cataloguing team; he was succeeded by Alan Coates who headed the project from 2000 to its completion, during which time Jensen served as a consultant. Bod-inc. was published in the 400th anniversary year of the publication of the first catalogue of the Bodleian Library in 1605. The aims of Bod-inc. are summarized in the catalogue's introduction: Bod-inc. is divided into six volumes: A Catalogue of Books Printed in the Fifteenth Century now in the Bodleian Library A Catalogue of Books Printed in the Fifteenth Century now in the Bodleian Library (cited as Bod-inc.) is