单选题 Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm (面向对象的机制). Object-oriented analysis consists of three steps. The first step is 36 modeling. It determines how the various results are computed by the product and presents this information in the form of a 37 diagram and associated scenarios. The second is 38 modeling, which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is 39 modeling, which determines the actions performed by or to each class o Subclass and presents this information in the form of 40 diagram.