Autodesk - Alias and some ADT - Revit

One paragraph in this article on The Deal about the Deal (Interview with Autodesk and Alias) was about ADT and Revit:

Dave brought up a recent acquisition in Autodesk to use as a comparison. He pointed out that when Autodesk acquired Revit for the architecture space users felt it was in direct competition with Architectural Desktop a product they already owned. "Both teams remained intact, both products remain separate, and grow separately still today". This is a perfect example of a sucessful implementation of just this concept in the 3d space.