上游充通大￥ SHANGHAI JIAO TONG UNIVERSITY With all these design methods came numerous modeling languages. © By the early 90's there were 50+distinct OO modeling languages. © Darwinian forces in the marketplace led to three dominate methods,each having its own modeling language. Software EngineeringSoftware Engineering With all these design methods came numerous modeling languages. By the early 90’s there were 50+ distinct OO modeling languages. Darwinian forces in the marketplace led to three dominate methods, each having its own modeling language