Leo set me the challenge of comparing Book and Lesson and I've done so on our training site.
First, I created a Lesson on Creative Commons licensing. Then I created a Book with the content and two quizzes for the assessment. I hope it will be self-evident why I felt two quizzes were needed, if not - please ask in the comments below this post.
Visit http://training.brightcookie.com and log in as username with the password Bc followed directly by our toll-free phone number.