The conference proceedings for the thirtieth anniversary of the OVI have been published as the fifth volume of the “Quaderni del Bollettino dell’Opera del Vocabolario Italiano” series. The conference, held in December 2015 and entitled “Attorno a Dante, Petrarca, Boccaccio: la lingua italiana. I primi trent'anni dell'Istituto CNR Opera del Vocabolario Italiano (1985-2015)”, brought together the researchers of the OVI and leading national and international experts, for an assessment of the Institute’s activities and to establish upcoming goals.