Expansion of Design Groups 
Just a thought. The Role of Design Groups was very much affected by the rise of the internet and the integration of information technologies. This caused new skills such as ethnography, cognitive science, information architecture, etc. to be integrated into more traditional design skill sets. I would say that Clement Mok was an instrumental bridge between traditional design consultancies and the new interdisciplinary consultancies. I would also state that Ideo was very much driven from engineering as David Kelly's background is in engineering. It seems as if industrial designers and engineers invigorated designers and design methods. These are a few thoughts to chomp on . . . .( )