On February 4, 2025, the presentation of the volume “Con metodo e con rigore. Scritti di bibliografia e biblioteconomia di Diego Maltese (1956-2023)”, edited by Mauro Guerrini, with the assistance of Patrizia Calò and the collaboration of Pino Buizza, was held at the National Central Library of Florence. The book has been published by the Italian Library Association, with notes by Laura Ballestra, Pino Buizza, Attilio Mauro Caproni, Giuliano Genetasio, Mauro Guerrini, Anna Lucarelli, Elisabetta Sciarra, Tiziana Stagi, Elis- abetta Viti. “Biblioteche oggi”publishes the texts of Francesca Sorrentino, Ignazio Pirronitto, and Giovanni Bergamin. Gloria Cerbai intervened in the debate, and read Diego Maltese’s thanks to Mauro Guerrini. The speakers highlighted the characteristics of the 159 essays selected by the editor, arranged in twelve thematic sections. Maltese laid the foundations of contemporary Italian cataloguing, attributing to it a central role in the theoretical and applicative fields; he had a systematic vision of the library; he made a fundamental contribution to the debate in the 1970s and 1980s about the role of the National Central Library of Florence as a National Book Archive, of the BNI as the heart of national bibliographic services, and as the Italian agency for universal bibliographic control.