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José Aguilar Universidad de Los Andes, Venezuela and John Atkinson Universidad de Concepción, Chile and Yezid Donoso Universidad del Norte, Colombia and David Fernández-Baca Iowa State University and Ernst L. Leiss Department of Computer Science, University of Houston, TX 77204, USA and Gabriela Marin Escuela de Ciencias de la Computacion e Informatica, Costa Rica and Luciana Nedel, Federal University of Rio Grande do Sul and Oscar Pastor DSIC – Politecnic University of Valencia Spain

Preface to CLEI 2011 special issue