There's an interview on VentureBeat with Dave Stohl, talking with the vice president for studios at Activision Publishing about the Call of Duty series of military first-person shooters. The series has had multiple developers for years, but it is still eye-opening to read just how many developers are currently tending to the franchise, as the article states Activision "has four or five studios working on Call of Duty titles at any given time. This includes the remainder of Infinity Ward teamed with Sledgehammer Games on Modern Warfare 3, Beachhead Studios at work on Call of Duty Elite, Treyarch working on the non-Modern Warfare arm of the franchise, and DemonWare handling network services for the whole series. As for the headcount this represents, they state: "Activision has said that it has more than 500 developers working on Call of Duty."