Hi Arthur: Well, I get your point; I could have a sidebar about learning always being easy. But you've got a point about our personal preparation being necessary. The thought, planning, effort, and time that's put into a lesson will be evident as the class proceeds. Materials are ready, Handouts are copied. Slides and lecture flows smoothly and seamlessly from transition to transition. Questions are drawn right into the lesson as if planned that way. Then back to the lesson. Students will expect classs to be under the control of the teacher. Regards, Barry