●  Object-oriented  analysis  (OOA)  is  a  semiformal  specification  technique  for  the object-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  this information in the form of a  （72）  and associated scenarios. The second is  （73）  , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The  last step is  （74）  ,  which determines  the  actions  performed  by or to each class or subclass and presents this information in the form of  （75）  .