The authors propose the icon-based animation of software requirement specifications by using the object and dynamic models of the OMT methodology. In order to produce icon-based animation, they use graphical classes and icon transformations. In general, the graphical classes are defined for each class of the object diagram. The icon transformations which show the activities of the application are constructed by considering the meaning of the activities and are defined by either basic or compound icons. The icon transformations are added to the state diagrams to generate extended state diagrams. The animation system generates the header files and the code instantiating GUI from the object diagram having graphical classes. The system also generates event methods from the extended state diagrams. When the event methods are executed, the behavior of the events is animated by the icon transformations.