There were'nt alot of significant changes from 2000-2003. Others may not agree but as far as the basics go there were'nt alot of changes. There were a few new tools and improvements in the drawing and sketches and assemblys but most all of the important tools are the same. There is a pretty significant change in 2004. We just upgrade to 2004 and it's a good deal different. It still has all the basics stuff as the earlier versions but alot of new tools and shortcuts. If you mainly want to learn the part making drawing and assembly features an older book will do you well. If you want to learn more of the advanced features buy a newer book.