This DVD-ROM contains Prue Shaw's transcripts, collations and analysis of seven key manuscripts of Dante's Commedia, the most important single work in Italian literature and one of the masterpieces of world literature. The transcripts are accompanied by digital images of all pages of six of the manuscripts, all newly made in high-resolution full colour, and by the full text of the editions of Petrocchi and Sanguineti. A full word-by-word collation shows all variants at every word, viewable in either the original manuscript spelling or in a standardised form. Variant search and variant map features offer new ways of exploring the relations between the versions. Extensive editorial commentaries analyse the relations among the surviving texts, and examine the view of the tradition recently set out by Federico Sanguineti. Throughout, the publication interface provides access to every word in every version, to the variants on every word, and to tools and commentaries permitting exploration of the different versions.