Information System Development Ideally,an information system is developed Linear Starting from scratch(从头 Requirements 开始) In the real world,it is very Analysis different We make mistakes Design The client's requirements change Implementation DevelopmentSlide 2.3 3/50 Information System Development Ideally, an information system is developed – Linear – Starting from scratch(从头 开始) In the real world, it is very different – We make mistakes – The client’s requirements change