The reasons why professional development does not often occur in the language school seem as numerous as the research studies suggesting its value. Common complaints of teachers working in this setting include the number of contact hours per week; schedules including classes in the early morning, afternoon, and late into the evening; last minute schedule changes (usually meaning additional classes); and the travel time required to get to and from class. Teachers may also have to contend with adapting company materials to their class needs, and balancing the demands of being an educator with being an entertainer. Additionally, employers are generally unwilling to sacrifice potential profit by allowing teachers a regularly scheduled time for teacher development. The time constraints placed on teachers by their schedules, the lack of organizational support, and the lack of interest among co-workers often block avenues for professional development beyond the occasional visit from a textbook company representative.