This work-a parallel-text edition that contains all four versions of Piers Plowman-constitutes a major enterprise of textual scholarship and will provide for students of Langland a modern equivalent to Skeat's standard edition of 1886. This revised and corrected three-volume set is specifically designed to facilitate study of the parallel text (Volume 1) alongside both the textual notes (Volume 2, part 1) and the commentary/glossary (Volume 2, part 2), and is intended to make the entire edition available to as many students of Langland as possible.