Résumé : The conference aims to develop the dialogue between experts and researchers from public and private, to acquire basic and experimental on Information Systems and Business Intelligence (or economic intelligence (EI) in French terminology) (SIIE). This promotes, in a risk environment, technologies related to economic intelligence. The dynamic of EI depends on the control of knowledge and requires competences to design the best strategies and ensure that decision-makers to take the right decisions. The international conference SIIE will be held in its fourth edition at Marrakech in February 2011, after the first three successful editions in Tunisia. The 2011 conference is supported by the University of La Manouba (Tunisia), the University of Nancy (France), the High Institute of Applied Engineering - IGA (Marocco) and is sponsored by the Higher Education Ministry of Marocco, (...), and IEEE. The first three editions (2008, 2009 and 2010) have allowed academic researchers and economic actors to achieve completed projects. The goal of SIIE is to continue in this way by creating opportunities, ideas and innovative ways to enhance projects, and build connections between universities and industries on both sides of the Mediterranean sea. SIIE'2011 includes lectures, tutorials, sessions and panels by experts, to identify new approaches and knowledge in economic intelligence, applied research and feedback. This will allow the emergence of new clusters in competive intelligence. In a friendly framework, pleasant and cordial life context, the SIIE conference has always been thought to promote the weaving of trust networks between actors in academia, industry and political. The expert recommendations and advices will help the SIIE community to find solutions to their many questions and problems.