“…These requirements, however, are confronted with the existing heterogeneity of the different standards, terms and measuring methods in the environmental field as well as of hardware and software environments, database systems, method and model bases, network technology, and programming languages. Approaches for overcoming the heterogeneity, one of the major obstacles to open software solutions, can have a tremendous impact on the productivity in environmental management, and can also lead to a greater stability in system design and system usage in environmental information processing Hilty 1995a).…”