Abstract: A method and apparatus for providing dynamic classification of objects. The system provides for dynamic classification of objects within a simulator environment and also contains a graphical user interface related to the simulator environment. The apparatus includes a display, a processor, and an input device. A processor generates a simulation environment on a display screen and a user interfaces to the system with a user input device. Objects within a simulation take on user specified rules and properties that define their behavior. A graphical representation is provided for categorizing classes of objects. A graphical representation of a jar provides a label for defining the identity of the jar and a first region into which items (e.g., icons representing instances or classes of objects) can be dragged and dropped. These items become members of the dynamic class defined by the jar.