I guess this is basically what I was getting at, but I just do it in my head and imagine myself in front of a pit class. You start explaining it to the class, then when you run into a problem, you go to the book and figure it out. Then, continue teaching. Oddly enough, obsessedwithbrewcrew, I first started doing this when I was in Weather and Climate class http://forum.brewerfan.net/images/smilies/smile.gif