The translation, Translator's note on the text, and Glossary are the work of Margaret Atkins. The Introduction and Further reading are the work of Thomas Williams. Both editors contributed to the annotations, and each of us read and commented extensively on the work of the other.

Margaret Atkins would like to thank her colleagues at Trinity and All Saints, and above all Geoffrey Turner, for making possible the year's leave in which this translation was largely completed, and Alison and Bob Samuels for their unfailingly warm welcome on visits to Oxford. The hospitality of the President and Fellows of Magdalen College, Oxford, and of the Rector and Professors of the Pontifical University of St Thomas, Rome, made this an extremely pleasant and fruitful year. She would also like to thank many friends and colleagues for advice and help with Thomistic questions, and in particular Kevin Flannery, SJ, for guidance in matters Aristotelian, especially with reference to On the Cardinal Virtues, article 3.

Thomas Williams is grateful for the superbly capable help of his research assistant, Brett Gaul, in tracking down references, indexing, and preparing the typescript for publication.