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Towards a General Framework for Modelling Roles Genovese, Valerio Roles Organizations Object OrientedModelling Multi-Agent Systems Security. Role is a widespread concept, it is used in many areas like MAS, Programming Languages, Organizations, Security and OO mod- elling. Unfortunately, it seems that the literature is not actually able to give a uniform definition of roles, there exist several approaches that model roles in many different (or even opposite) ways. In this draft we start to define a meta-model for roles. Our aim is to build a formal framework through which we can describe different roles appeared in the literature or implemented in up and running computer systems. In particular we give a new definition of role’s foundation introducing ses- sions, which are a formal instrument to talk about role’s states and we show how sessions may be useful to model many different role’s accounts. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Valerio Genovese 2007 Is Part Of Dagstuhl Seminar Proceedings, Volume 7122, Normative Multi-agent Systems (2007) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DagSemProc.07122.29 urn:nbn:de:0030-drops-9256 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07122.29 eng https://creativecommons.org/licenses/by/4.0/legalcode