The program I have been attempting to learn, AliasDesign, has been cryptic to say the least. The tutorials provided little help, demonstrating the most rudimentary actions. To make matters worse, the program is not compatible with Windows. Needless to say, I was not reluctant to convert to the Windows equivalent (AutoDesk Inventor), which, incidentally, is a much more intuitive program. I expect to make much greater headway on my project using this software.