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This paper focuses on reasoning about change within the object-oriented modeling system EMSY. EMSY has been developed to support modeling and simulation in the domains of ecology and biology. Ecological systems are described as entities consisting of a set of attributes. rules, information about composition, environment, and coupling structure. Change takes place as the change of single entities, and is initiated by them. This specific view of systems serves as a base to describe a characteristic phenomenon of ecological systems: the change of system structure.