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Information Visualization techniques have been successfully used to build visual and interactive analysis of data and data relationships. One of its possible areas of application is computer network monitoring and traffic analysis. The analysis of the internal behavior of a company with high demand for Internet services helps to determine if the company is competing with its own clients over the available resources for online transactions, or event putting client information in risk. PRISMA, a tool with multiple coordinated data views has been analyzed to find patterns involving transactions against the company security policies. The goal is to suggest changes to improve the quality of service.