Title page from 'Quaderno doppio col suo giornale, nouamente composto, & diligentissimamente ordinato, secondo il costume di Venetia', by Domenico Manzoni (Venice, 1554). [Library shelfmark: ICAS.557]
The 'Quaderno doppio' by Domenico Manzoni is the first important book on bookkeeping published after Luca Pacioli's 'Summa de arithmetica'. It proved so popular that it went through 7 editions.
Although Manzoni's text closely follows Pacioli, it was notable for its 300 sequentially numbered and indexed journal entries giving examples of different types of transactions.
This indexed journal gave bookkeepers a ready reference if a particular business event fitted one of the sample entries.
Manzoni was a professional bookkeeper and teacher of arithmetic.