The development of object oriented concept has mainly three stages: Object Oriented Analysis (OOA), Object Oriented Design (OOD) and Object Oriented Practicality (OOP).

• 面向对象开发一般经历三个阶段：面向对象的系统分析(OOA)，面向对象系统设计(OOD)和面向对象系统实现(OOP)。