Abstract :
Copyright (c) 2012 by the Iberian Association for Information Systems and Techonologies (AISTI). All rights reserved. Copyright and Reprint Permissions: abstracting is permitted with credit to the source. Libraries are permitted to photocopy beyond the limit of US copyright law for private use of patrons those articles in this volume that carry a code at the bottom of the first page, provided the per-copy fee indicated in the code is paid through Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923. For other copying, reprint or republication permission, write to AISTI, Rua David Correia da Silva, 407, 5 T, 4435-200 Rio Tinto, Portugal. All rights reserved. IEEE Catalog Number, electronic: CFP1203K-CDR. ISBN: 978-989-96247-7-1.
