Dude, you're way off base on this one. Everything was dimensioned, I have never learned how to turn off the dimensions. The dimensions and constraints have nothing to do with the issues I spoke about, Not One Thing. I have faithfully read the book word for word 100% thus far. I even went into sketch mode in my drawing when whoever first said that and low and behold what did I see DIMENSIONS, yet you say I had none. How do you draw in Inventor without turning the the dimension button off, I'm not deleting them, yet you say they are non existent, that is absolutely IMPOSSIBLE. If there were no dimensions, there would be no extrusions, heck there wouldn't be anything saved, cause I never would have made it out of sketch mode, since you can't save while in sketch mode. The book issue was cited because of the lack of knowledge about the STP and IGS files. The model that was sent to me for downloading looks just like my model except for it was done in less steps, and is non-existent with lines, which I already said I tried to clean up, and it killed the drawing. Years of Inventor experience will refine your process. I buddy of mine tried for a day and half to extrude sheet metal with 3 bends, and even an angled section per each side of four using Architectural Desktop 2005 (AutoCAD 2005 with more bells and whistles), I knocked it out in 60 minutes in 3D AutoCAD, and I hadn't worked with AutoCAD in 2 1/2 years, and he uses it everyday at work in the 2D realm, he was shocked cause he just spent 12 hours at work trying to do the same task. He was a product of teh teacher that threw the AutoCAD books at us, and provided no instruction at all. I even told him how to accomplish the task over the phone, while he wasn't as his computer after he already spent the 12 hours, He spent 12 hours on the task before he made the long distance phone call for help. I cleaned one drawings lines up yesterday in Inventor, by another method without crashing. I cleaned up the bushing and boom it killed it, Thanks heavens I saved a copy of the drawing before playing with it. The phrase you're only as good as your teacher/ book/ and school refers to not knowing techniques that weren't presented in the book, etc yet be criticized for the s same very techniques. I guess everyone jumps into inventor and becomes a master day one. The issues with Inventor have to deal with lack of being user-friendly, I am just past my 4th day of Soldiworks and have almost bypassed the placement I am with Inventor which I have already completed and ACED the first 40 hour course of Inventor, with the exception of assemblies in Soldiworks, that is how tough Inventor is to get to do what you want it to do. Half of my Soldiworks class is in my Inventor class, and guess what subject was discussed tonight without me even saying a word, the lack of user-friendly ability in Inventor. One guy has been a Soldiworks drafter for 2 years, he just doesn't have the college credit to clep out, so he's taking it, and looking into testing out of it. The advsior to our program has a field of study of computer programming, with absolutely NO knowledge of CAD or Drafting whatsoever, this is why it's just being handled now. I can solve issues with a drawing not revolving or extruding in solidworks ON MY OWN, which has been the case the first day of class. This is the ease of soldiworks. I had to have the Invntor teacher come over day 1 when I was at a stand still, as time progressed I could iron out more problems on my own, but I and the others are still greatly frustrated with Inventor, and just wish it were as user-freindly as Solidworks. This intense discussion tonight about Inventor was brought up by the guy with 2 years Soldiworks experience, cause he is still upset over last weeks Inventor class which we have tonight (Thursday Night).