The introduction discusses the county boundary; the Hundreds, their reconstruction and revised name-forms; related or 'satellite' texts, the "Liber Exoniensis" (Exon); the one Wiltshire entry in Exon (34,1); the Tax Returns; the identification of places; the state of the manuscript for the county; the editorial history of earlier versions of the notes, and the current state of the revision. Some material in this introduction derives from the original printed edition published by Phillimore (1979) and edited by Caroline and Frank Thorn.