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1.) Decision Support Systems (DSS)- are a specific class of computerized information system that supports business and organizational decision-making activities. A properly-designed DSS is an interactive software-based system intended to help decision makers compile useful information from raw data, documents, personal knowledge, and/or business models to identify and solve problems and make decisions.(www.wikipedia.com)
2.)Management Information System (MIS) is a subset of the overall internal controls of a business covering the application of people, documents, technologies, and procedures by management accountants to solving business problems such as costing a product, service or a business-wide strategy. Management Information Systems are distinct from regular information systems in that they are used to analyze other information systems applied in operational activities in the organization while Decision Support System are Typical information that a decision support application might gather and present would bean inventory of all of your current information assets including legacy, relational data sourcescomparative sales figures between one week and the next, projected revenue figures based on new product sales assumptions; the consequences of different decision alternatives, given past experience in a context that is described.
3.)DSS can improve company's competitive advantage and organizational performance in away that DSS belong to an environment with multidisciplinary foundations, including (but not exclusively) database research, artificial intelligence, human-computer interaction, simulation methods, software engineering, and telecommunications.(http://www.wikipedia.com/)
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