This volume contains the first critical edition of Girald Odonis (d. 1349), "De intentionibus," Girald discusses the problems of conceptualization that the philosophers and theologians around 1300 were faced with in their attempts to show that the various concepts ("intentiones") we use to describe the outside world reliably represent Reality. The text edition is prefaced by an extensive study of the intentionality debate around 1300. This debate is described in terms of what is nowadays called cognitive psychology and epistemology.

L.M. de Rijk, Ph.D. (1952) in Classical Philology (Utrecht), is Emeritus Professor of Ancient and Medieval Philosophy (Leiden) and Honorary Professor at the University of Maastricht. He is the author of a large number of publications on ancient and medieval philosophy, including Abailard's Dialectica (1956), a work on terminist logic, Logica Modernorum (1962-67), Peter of Spain's Summulae logicales (1972), La philosophie au moyen âge (Brill, 1985), The Letters of Nicolas of Autrecourt (Brill, 1994), Girald Odonis, Logica (Brill, 1997), and Aristotle Semantics and Ontology (2 vols. Brill, 2002).