I found this tutorial to be the most incomplete and confusing manual I've seen in a long time. It's pretty obvious to me that the text was not proved out by inexperienced users prior to publication nor was it proofed by the author. There is a lot of extraneous verbiage that is not germane to the information presented, as well as sections missing, not enough pictures of the menu structure layout and no index to help find commands. Also very little useful info regarding how to correct mistakes and how to continue a model after quitting out of it in the middle of the entry of information.