On behalf of the organizing committee, it is our pleasure to welcome you to the six edition of the International Conference: Information Systems and Economic Intelligence (SIIE). The conference in Hammamet (Tunisia) has been co-organized by researchers from the University of Manouba (Tunisia), from University of Lorraine (France). It is sponsored by the Ministry of Higher Education of the Republic of Tunisia, ISKO-Maghreb Chapter and IEEEsection Tunisia. The central topic of this conference is competitive intelligence (CI) and extended to business intelligence. Business Intelligence (BI) has been defined by I.E. Harold Wilensky in 1967 as the activities of production of knowledge for economic and strategic goals of an organization, collected and produced in a legal context. To set up an economic strategy, one needs to have a maximum of relevant information. The role of BI is to provide relevant and oriented information to the decision-makers. This information is an essential source for making the right decision to guarantee the durability of an organization. Several powerful computer tools are available to collect the necessary significant information. Business Intelligence is based on data processing collected from various cross economic sources. The competitive market makes the acquisition of knowledge necessary. However, to get information is not sufficient, one has to be able to exploit it and to transform it into knowledge. Based on these findings, enterprises, industries, universities and states have invested in this new discipline that plays an essential role in the performance and competitiveness. The relationship between value-added information, knowledge and decision is more than ever asked. Competitive intelligence is both a field of theoretical research and practice process, which requires a multidisciplinary approach. Moreover, the actors of this area are of different fields: scientific, R&D, manager, financial, etc. They all participate to retrieve relevant data, strong and weak signals, added-value information and processing into knowledge and then decision-making units. SIIE Conference since its first edition in 2008 provides to scientific and economic partners a space of exchanging. SIIE’2015 will offer five keynotes, one per half-day, related to the multidisciplinary topic of BI, they will be presented by world-class experts. It will propose also twenty-seven regular papers and two thematic symposium: one on "Structuring Multimedia Streams" and one as "Doctoral Symposium" with fifteen posters of PHD candidates. We would like to thank the Scientific Committee members and reviewers who have permitted to set up a scientific program of quality. Also, we would like to thank the Organizing Committee members for making SIIE’2015 an enjoyable and memorable meeting. Our gratitude goes finally to the authors of papers that have made these days of Hammamet very attractive.