● Object-oriented analysis (OOA) is a semiformal specification technique for theobject-oriented paradigm. Object-oriented analysis consists of three steps. The first step is（71）. It determines how the various results are computed by the product and presents thisinformation in the form of a  （72）  and associated scenarios. The second is  （73） , whichdetermines the classes and their attributes. Then determine the interrelationships and interactionamong the classes. The last step is  （74） , which determines the actions performed by or toeach class or subclass and presents this information in the form of  （75） .