FACTS-Professor Dixon was an adjunct professor at Tulsa Community College (TCC) in Tulsa, Oklahoma. Each semester, near the beginning of the term, the parties executed a written contract that always included the following provision: "It is agreed that this agreement may be cancelled by the Administration or the instructor at anytime before the first class session." In the spring semester of Dixon's seventh year, he filed a complaint with TCC alleging that one of his students, Meredith Bhuiyan, had engaged in disruptive classroom conduct. He gave her an "incomplete" grade and asked TCC to require her to apologize as a condition of receiving a final grade. TCC later claimed, and Dixon denied, that he was told to assign Bhuiyan a grade if he wanted to teach in the fall. Toward the end of the semester, Dixon was told which classes he would teach in the fall, but the parties did not sign a written contract. The Friday before classes began