Jali- What if there was one tutorial that explained the differences. That gave a general foundation to the approach to modeling in different ways, so that we or whom ever that was interested in this would have a good idea as of what to think about when going into a modeling session. This is what I meant, is all, sorry for the confusion, but there are others like me out there that wonders about the very same thing, you just have not met them yet. Savnac