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Demonstration; International audience; Within the framework of the European project EcoBioCap (ECOefficient BIOdegradable Composite Advanced Packaging), aiming at conceiving the next generation of food packagings, we introduce an argumentation-based tool for management of conflicting viewpoints between preferences expressed by the involved parties (food and packaging industries, health and waste management etc.). The requirements and user preferences are modeled by several ontological rules provided by the stakeholders expressing their viewpoints and expertise. The argumentation tool implements the process which has been introduced in previous work [10,11] combining a description logic (DLR-Lite) within ASPIC framework for relational database querying purposes. In this paper, we recall briefly the principles underlying the reasoning process, and we detail the main functional- ities and the architecture of the argumentation tool covering the overall reasoning steps starting from formal representation of text arguments and ending by extraction of justified preferences. Finally, we detail its operational functioning through a real life case study to determine the justifiable choices between recyclable, com- postable and biodegradable packaging materials based on stakeholders’ arguments.

National audience; The aim of the paper is to aggregate preferences expressed by different actors. The aggregation process is based on argumentation techniques enriched with a negotiation phase. The final aim of this process is to support decision making. The work presented here is a part of the European Project EcoBioCap (ECOefficiant BIOdegradable Composite Advanced Packaging) that aims at providing new, eco-efficient packaging to european food producers. One of the tasks of the project is to provide a decision support system allowing to help into the choice of a packaging for a given food product. Such packaging must satisfy, at its best, preferences expressed by different actors on several criteria, not always mutually compatible. To reach this goal, we have proposed a preference logic that allows the actors to express formally their preferences. This language has then been used as the basis of an argumentation system, instantiated from ASPIC+. This allowed, by the means of extensions, to obtain maximally consistent packaging properties. When several extensions contain desirable features, a negotiation process is realized in order to add knowledge to the system which will eventually allow certain inconsistencies to be resolved. An implementation has been performed in order to test our approach with domain experts.; L'objectif de ce papier est d'agréger les préférences de différents acteurs d'un domaine, en utilisant les techniques d'argumentation puis de négociation, pour l'aide à la prise de décision. Ce travail s'insère dans le cadre du projet européen EcoBioCap (ECOefficiant BIOdegradable Composite Advanced Packaging), dont le but est de fournir aux filières agro alimentaires européennes de nouveaux emballages éco-efficaces, personnalisables et biodégradables. Une des tâches du projet EcoBioCap est de fournir un système d'aide à la décision facilitant le choix d'un emballage pour un produit donné. Ce choix d'emballage doit satisfaire au mieux de nombreux critères, pas toujours compatibles entre eux et exprimés par différents acteurs. Pour ce faire, une logique de préférences, composée d'un langage et d'une sémantique, a été proposée afin de permettre aux intervenants d'exprimer leurs préférences dans un cadre formel. Cette logique a été par la suite intégrée dans un système d'argumentation (instance de ASPIC+) afin d'extraire à partir des préférences exprimées les ensembles de conclusions justifiées appelées extensions. Ces dernières présentant des conclusions contradictoires sont enfin soumises à un processus de négociation pour la résolution des conflits nécessaire à l'aide à la prise de décision. Un prototype a été implémenté afin de valider notre approche avec les experts du projet.

The objective of this research project is to aggregate the preferences of different stakeholders using argumentation in a Negotiation Phase. This is done in the context of a specific project, which is explained in this thesis. The aggregation of several stakeholders' preferences may incur into different conflicts due to differences in the needs of each stakeholder. This is where argumentation can be used in order to solve conflicts, as new information may appear and lead to changes in the preferences, even adding new preferences or removing old ones. The concept of Negotiation Phase is introduced in order to allow stakeholders to review their preferences, discuss, argue, and enter new information. As a result of this phase, preferences may be changed in order to solve conflicts, or we may find out that a conflict is not solvable by argumentation, leading to other solutions such as splitting a scenario in order to manage different choices separately.

International audience; A decision support system (DSS) can facilitate and enhance the group decision making process. Such a DSS must typically aggregate the preferences of multiple entities in the group in order to recommend a final decision. Argumentation forms a natural way of encoding reasons as to why some action should be taken (or avoided), and, in this work we instantiate an argumentation system designed to aggregate the preferences of multiple parties where preference information is defined in terms of expertise knowledge on the topic. We propose a formal language of preferences which we use within our argument framework, and describe how arguments and argument related concepts such as attacks between arguments can be obtained. We also discuss how to consider different viewpoints elicitation within our framework, and in particular, how the viewpoints of an expert can be represented. The framework we describe below is aimed at a specific use-case, which has emerged from the EU funded EcoBioCap project. This project's goal is to provide the EU food industry with customisable, eco-efficient, and biodegradable packaging solutions, offering direct benefits to the environment, as well as to consumers in terms of food quality and safety. One aspect of this project requires a strategic analysis of stakeholder requirements to be carried out, allowing the project to identify an initial set of potential packaging materials on which further experiments can be carried out. The stakeholders in this domain include consumers, manufacturers and food scientists, together with other experts on the properties of different packaging materials. Our aim is to identify a ranked list of relevant packaging solutions that are consistent with each entities expertise and preferences (as well as their justifications for these preferences).