 Another, complementary, line of inquiry has been suggested by Malcolm De Mowbray. According to him, many of the theses may have originated from students during disputations in the schools. Given the oral character of these exercises, it is only natural that they are difficult to trace in extant works from masters of arts. Evidence for his interpretation has De Mowbray found in Boethius of Dacia’s De aeternitate mundi, which, according to him, was meant to help students to hold a disputation. Much of De Mowbray’s interpretation hinges on our understanding of the Preface of Tempier’s condemnation, which mentions some people at the arts-faculty (nonnulli Parisius studentes in artibus) who had discussed and disputed the condemned articles in the schools (in scolis tractare et disputare presumunt, ut eis nescient respondere). His interpretation has been contested by Luca Bianchi.