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xxii Acknowledgment It is imperative to begin these few lines with my special thanks to the authors and reviewers of every chapter, whose labour and dedication where so remarkeable as to make it easy to complete this work. I am equally grateful to those who helped with the blind review process, without whom it would be impossible to achieve a book of this caliber. But my special thanks in reviewing go to my colleagues of the Researching Group on InterAction and eLearning (GRIAL) who gave their time and effort to provide constructive and comprehensive feedback extremely useful to finish this work. They include Valentina Zangrando and Antonio Seoane, who helped me with the final revision of the entire book. I would also like to thank the editor Jessica Thompson for her efficiency and generosity in working with us, and the publishing team of IGI Global for their competence and expertise. Finally, I express my gratitude to the Education and Science Ministry of Spain, National Program in Technologies and Services for the Information Society, since this book has been developed inside the KEOPS research project context (Ref.: TSI2005-00960) financed by the Govern of Spain. Francisco José García Peñalvo University of Salamanca