—Becoming more competitive and more effective in the current scenes of Business and Public Administration, the organizations must be able to approach easily and quickly to the information on the customers and the external conditions of market. In other words it means to head at the improvement of the Decision Support Systems. Decision Support System is concerned with developing systems aimed at helping decision makers solve problems and make decisions. In this paper, we refer to a decision support system based on flexible architecture able to discover the knowledge in a distributed and heterogeneous multi-organization environment. The system architecture has been designed according to the Service Oriented Architecture and Model View Controller design pattern. Moreover it is based on a mining engine whose purpose is to generate and to use suitable e-services for knowledge by driving the user through various stages of the Knowledge Discovery process. An Intrusion Detection application ...