Hello Steve, I too have experienced those students who think they know it all as being very challenging. I use alot of the tatics that you use with these type of students. I always give these students added responsibilities. In addition, I tend to pair an inexprience student in the area with one of the challenging students so that the challenging student can act as a mentor for the inexperience student. I've seen when the challenging student does not do extremely well on an assignment, project, test, etc. this tends to humble the student quite a bit. I've learned with the "Know it Alls" you must always be ready because they thrive off of trying to show the class they know just as much or more than you. Patricia