I have some students who work hard and go above and beyond to meet all the requirements of the course, while others only attempt to meet the very minium requirements, and still others do not even meet the minimum requirements of the class. This adds a lot of strees on not only the instructor, but it also adds stress to the students. Adult learners get easily frustrated when they are paying a lot of money for a class and doing all they can to succeed when some students are impedeing the productivity of the class because of their poor performance. This adds to my stress as an instructor in addition to the stress of the students, and the negative spiral continues. I have started implementing consequences for poor performance and bonuses for good performance. It seems to be working well.