Similar (Simulations with Multi-Level Agents and Reactions) is a Multi-Level Agent-Based Modeling formal meta-model based on the Influence Reaction model which views action as a two step process:

• agents produce "influences", i.e., individual decisions, according to their internal state and perceptions,
• the system "reacts", i.e., computes the consequences of influences, according to the state of the world.

Relations (of perception and influence) between levels are specified with digraphs. These graphs, along with the temporal relations between levels allow to distribute the scheduling of simulations by level. Similar is deeply inspired by IRM4MLS. The main differences between Similar and IRM4MLS are the more precise and less misleading terminology and simulation algorithms, as well as a more precise and implementation-oriented model for the reaction phase (see this page and this paper).

Similar implementation is written in Java and released under the CeCILL-B license.

Copyright or © or Copr. LGI2A LGI2A - Laboratoire de Genie Informatique et d'Automatique de l'Artois - EA 3926 Faculte des Sciences Appliquees Technoparc Futura 62400 - BETHUNE Cedex http://www.lgi2a.univ-artois.fr/ Email: gildas.morvan@univ-artois.fr Contributors: Gildas MORVAN (creator of the IRM4MLS formalism) Yoann KUBERA (designer, architect and developer of SIMILAR) This software is a computer program whose purpose is to support the implementation of multi-agent-based simulations using the formerly named IRM4MLS meta-model. This software defines an API to implement such simulations, and also provides usage examples. This software is governed by the CeCILL-B license under French law and abiding by the rules of distribution of free software. You can use, modify and/ or redistribute the software under the terms of the CeCILL-B license as circulated by CEA, CNRS and INRIA at the following URL "http://www.cecill.info". As a counterpart to the access to the source code and rights to copy, modify and redistribute granted by the license, users are provided only with a limited warranty and the software's author, the holder of the economic rights, and the successive licensors have only limited liability. In this respect, the user's attention is drawn to the risks associated with loading, using, modifying and/or developing or reproducing the software by the user in light of its specific status of free software, that may mean that it is complicated to manipulate, and that also therefore means that it is reserved for developers and experienced professionals having in-depth computer knowledge. Users are therefore encouraged to load and test the software's suitability as regards their requirements in conditions enabling the security of their systems and/or data to be ensured and, more generally, to use and operate it in the same conditions as regards security. The fact that you are presently reading this means that you have had knowledge of the CeCILL-B license and that you accept its terms.

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