These are information systems at the organization‘s management level that combine data and sophisticated analytical models or data analysis tools to support non-routine decision making. The information inputs to a DSS include low-volume data or massive databases optimized for data analysis, analytical models and data analysis tools. The processing consists of interactive simulations and analysis. The outputs consists of special reports, decision analyses and responses to queries. DSSs specifically serve professionals and staff managers. They enable them to make unstructured decisions e.g. business contract analysis, corporate planning and forecasting.