We discuss in this paper how the results of the discipline known as Knowled
ge Management could improve some types of Environmental Systems. In particu
lar we discuss Environmental Decision Support Systems (EDSS). In the last d
ecade, EDSS emerged as a suitable software tool to support control decision
-making to maximize the performance of a system and to minimize the negativ
e impact of faults. Knowledge Management in Environmental Decision Support
Systems appear as a necessity for EDSS users to place guarantees on the sys
tem's behavior but these methodologies are still under-explored. In this pa
per, a first approach to put forward a Knowledge Management Methodology by
identifying the most relevant issues, is introduced and discussed.