Report: Modern Warfare 3 Being Developed By Three Studios Infinity Ward developed the first two Call of Duty: Modern Warfare games on their own. However, for the third game it seems they needed to call in some outside help.
The LA Times reports that Modern Warfare 3 is being produced by three Activision-owned studios: Infinity Ward, Sledgehammer Games, and Raven Software. IW and Sledgehammer are said to be equal contributors on the single-player campaign. Raven, meanwhile, is tasked with handling the online portion of the game.