Joseph, again thanks for the reply and your patience. As you keep telling me, the Lesson option is very complicated.
In the Lesson settings there is an option called "Grade". I have chosen None for this option. That is what I meant by graded or not graded. None of the questions in my lessons will be graded. they are for self assessment only.
So if I continue to choose - Grade = None and then if I choose Practice Lesson = No, will this lesson display in the grade book but with no grades due to my choice of None for the Grade option?