A teacher undergoes many perplexing stresses every day. While teachers' academic assignments have become more specialized, the demands on their time remain diverse and contradictory. There are conflicts inherent in serving as an instructor, a disciplinarian, and an employee of a school district at the same time. For college professors, different types of role strain arise. While formally employed as teachers, they are expected to work on committees and are encouraged to conduct scholarly research. In many colleges and universities, security of position (tenure) is based primarily on the publication of original scholarship. As a result, instructors must fulfill goals that compete fir time.