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
Catalogue of Works in Refutation of Methodism over 100 individual documents, books, pamphlets and articles — many of which today are regarded as historical texts. As a whole the works listed assumedly refute certain doctrines of Methodist thought, although – if somewhat ironically – many of them are by Methodist authors themselves. The book is divided into two sections, the first being a preface entitled either "Prefatory Remarks" or "Preliminary Remarks", depending upon the edition of the book (the first edition of the work was printed containing the latter title), and the second being the catalogue proper – in all editions simply deemed "Catalogue". The Catalogue section