Professor Hughes was tired of students coming late to class, so he made an announcement in writing on Moodle that all students who came to class on time for every single class over the whole semester would be entered into a prize draw for a new laptop computer. Joe really wanted a new computer so he started making a big effort to be at class on time. One day there was a bus accident and everybody got caught in traffic, including Professor Hughes. That day the class started 10 minutes late. This was the only day that Joe was not in class on time, although he was there 5 minutes later, and before the class started. At the end of the semester Professor Hughes announced that there would be no prize draw as everybody had been late at least once. Joe wants to know if Professor Hughes can be required to hold the prize draw.