Bernard Roy, Forty Years of Esteem and Friendship -- Connectivity, Transitivity and Chromaticity: The Pioneering Work of Bernard Roy in Graph Theory -- Decision-Aid Between Tools and Organisations -- Talking About the Practice of MCDA -- Multi-Criteria Decision-Aid in a Philosophical Perspective -- A Characterization of Strict Concordance Relations -- From Concordance/Discordance to the Modelling of Positive and Negative Reasons in Decision Aiding -- Exploring the Consequences of Imprecise Information in Choice Problems Using ELECTRE -- Modelling in Decision Aiding -- On the Use of Multicriteria Classification Methods: a Simulation Study -- Ordinal Multiattribute Sorting and Ordering in the Presence of Interacting Points of View -- Multiattribute Interval Orders -- Preference Representation by Means of Conjoint Measurement and Decision Rule Model -- Towards a Possibilistic Logic Handling of Preferences -- Empirical Comparison of Lottery- and Rating-Based Preference Assessment -- Risk Attitudes Appraisal and Cognitive Coordination in Decentralized Decision Systems -- Logical Foundation of Multicriteria Preference Aggregation -- A Study of the Interactions Between the Energy System and the Economy Using TRIMAP -- Multicriteria Approach for Strategic Town Planning -- Measuring Customer Satisfaction for Various Services Using Multicriteria Analysis -- Management of the Future -- Methodologies for Solving Multi-Obiective Combinatorial Optimization Problems -- Outcome-Based Neighborhood Search (ONS) -- Searching the Efficient Frontier in Data Envelopment Analysis.