Naudé included a chapter in "Advice" for arranging the books. In discussing arrangement he quoted Cicero, "It is order that gives light to memory." He gave instructions that he considered logical. His subject headings included: theology, philosophy, jurisprudence, medicine, history, mathematics and humanities. Naudé would add other subject heading in later years but these categories best represented the known body of knowledge in the world. Each section should be divided into subheadings and begin with the principal authors followed by the commentaries.