Abstract. Business Intelligence (BI) Systems are today considered as a major strategic tool of many well-established companies like Lufthansa, TDC Telecom and AT&T. Of course, the knowledge derived from the experience of those companies could be helpful guide in building efficient BI Systems. Thus, this study highlights the main points arisen from the worldwide practice of building successful BI Systems. The managers usually expect from BI Systems the acceleration of their decision-making process while keeping the quality of each decision, the enhancement of their product development cycle, the maximization of the profit from existing product lines and the discovery of new opportunities, the establishment of better marketing with robust CRM. However, more than 50% of BI projects fail to meet these requirements. So this study investigates the critical mistakes commonly made by BI System developers and suggests profound solutions from the best BI practices.
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