 The "first generation" of game and simulation design is simple "I go, you go" turns that classic and family games like Checkers, Chess, Monopoly, and Risk have.The "second generation" of game and simulation design was created by Charles S Roberts, founder of Avalon Hill and known as the "Founding Father of Board Games".His version of "artificial time" is called a "phased-turn" and allows for "simultaneous play" of both players.