This book constitutes the refereed proceedings of the 9th Dortmund Fuzzy Days, held in Dortmund, Germany, 2006. The Fuzzy Days conference has established itself as an international forum for the discussion of new results in the field of Computational Intelligence. All the papers had to undergo a thorough review guaranteeing a solid quality of the programme. The papers are devoted to foundational and practical issues in fuzzy systems, neural networks, evolutionary algorithms, and machine learning and thus cover the whole range of computational intelligence.

Inhalt
Plenary Talk.- Invited Session: Fuzzy Multiperson and Multicriteria Decisions Modelling.- Neural Nets.- Applications I.- Plenary Talk.- Invited Session: Intuitionistic Fuzzy Sets and Generalized Nets I.- Invited Session: Soft Computing Techniques for Reputation and Trust I.- Applications II.- Invited Session: Intuitionistic Fuzzy Sets and Generalized Nets II.- Invited Session: Soft Computing Techniques for Reputation and Trust II.- Theory I.- Plenary Talk.- Invited Session: Looking at Language with Fuzzy Logic.- Theory II.- Theory III.- Plenary Talk.- Invited Session: Complex-Valued Neural Networks.- Theory IV.- Plenary Talk.- Invited Session: Intelligent Data Mining.- Invited Session: Preferences and Decisions.- Evolutionary Algorithms.- Theory V.- Invited Session: Fuzzy Sets 40 years after.- Applications III.- Poster Contributions.