In a design environment, not everyone will have the fun of designing the project.  There is also the grunt work where the dimensions and details need to be created.  If you have a large staff complemen, your software bill could be quite significant if you purchased a design package (like Inventor ) for all the designers.  Here is where Autodesk has worked some magic.

Due to the interoperability (both ways) Inventor is able to save the 2D drawing to a DWG which can be opened in AutoCAD (including AutoCAD LT) where it can be dimensioned and detailed (not edited).

Any additions will successfully reflect in Inventor once opened again as well as any design changes that are made will reflect in the AutoCAD package.