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This report presents the results of a project funded by the Environment Agency which builds on the previous creation of two software systems to diagnose and predict river health from biological and environmental data, namely the River Pressure Diagnostic System (RPDS) and the River Pressure Bayesian Belief Network (RPBBN). RPDS is a pattern recognition system to diagnose likely pressures at a river site. RPBBN is a reasoning system that can diagnose chemical concentrations from a biological community, or predict likely changes in a biological community from changes in chemical concentrations.