Abstract: Existing statistics reporting methods tend to be inflexible and difficult for operators to understand and use effectively. A graphical user interface is provided whereby operators are able to view a state/event model of an automated system and using that graphical user interface make changes to existing statistics, define new statistics and analyze existing statistics. As a result of user inputs made at this graphical user interface changes are effected in a statistics reporting application in order to generate actual values of the statistics. In some embodiments Unified Modeling Language (UML) is used to provide the state/event model and extensions to UML are described which improve the ability to create and modify definitions of statistics.