单选题：根据下列题干，回答题：Traditional structured analysis techniques focus

根据下列题干，回答题：
Traditional structured analysis techniques focus upon the flow of（　66　）within a system Object-oriented analysis emphasizes the building of real-world modelsIt examines requirements from the perspective of the classes and objects found in the vocabulary of the（　67　）domain
Traditional system design method emphasizes the proper and effective structure of a complex systemObject-oriented design method encompasses the process of object-oriented decomposition and a（　68　）for depicting both logical and physical as well as static and dynamic models of the system under design
Object-oriented programming is a method of implementation in which programs are organized as cooperative collections of objects, each of which represents an（　69　）of some class, and whose classes are all members of a hierarchy of classes united via（　70　）relationships
请选择（　66　）处最佳答案