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Agreement is one of the crucial social concepts that helps human agents to cope with their social environment and is present in all human interactions. In fact, without agreement there is no cooperation and ultimately social systems cannot emerge. Agreement is necessary in our everyday life.

Until recently, the concept of agreement was a domain of study mainly for philosophers, sociologists and was only applicable to human societies. However, this situation has changed in the recent years, especially with the spectacular emergence of information society technologies. Computer science has moved from the paradigm of an isolated machine to the paradigm of a network of systems and of distributed computing. Likewise, artificial intelligence is quickly moving from the paradigm of an isolated and non-situated intelligence to the paradigm of situated, social and collective intelligence. Hence, the concept of agreement has become key for a robust understanding and an efficient implementation of artificial social systems.

Agreement Technologies integrates many research efforts from different fields of Artificial Intelligence. Hence, this workshop is specifically tailored to research works related to this new approach. Finally, the editors would like to thank all the people that bring about WAT and Iberamia 2010. First of all, thanks to the authors for ensuring the richness of the workshop and the members of the program committee for their professionalism and dedication. Furthermore, we owe particular gratitude to the Iberamia organizing committee. Marc Esteva, Alberto Fernández, Adriana Giret and Vicente Julián WAT2010 Organizing Committee

MarcEsteva Artificial Intelligence Research Institute (IIIA), Spain) Adriana Giret
, Spain
 Universidad Politécnica de Valencia <author> <persName><forename type="first">Alberto</forename><surname>Fernández</surname></persName> </author> <author> <persName><forename type="first">;</forename><surname>Juan</surname></persName> </author> <author> <persName><forename type="first">Carlos</forename></persName> </author> <imprint> <publisher>Universidad Rey</publisher> <pubPlace>Spain</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b2"> <monogr> <title/> <author> <persName><forename type="first">Vicente</forename><surname>Julian</surname></persName> </author> <imprint> <publisher>IIIA-CSIC</publisher> <pubPlace>, Spain; Spain</pubPlace> </imprint> <respStmt> <orgName>Universidad Politécnica de Valencia</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b3"> <monogr> <title/> <author> <persName><forename type="first">Sascha</forename><surname>Ossowski</surname></persName> </author> <author> <persName><forename type="first">;</forename><surname>Juan</surname></persName> </author> <author> <persName><forename type="first">Carlos</forename></persName> </author> <imprint> <publisher>Universidad Rey</publisher> <pubPlace>Spain</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b4"> <monogr> <author> <persName><forename type="first">Vicente</forename><surname>Botti</surname></persName> </author> <title level="m">de Valencia, Spain) PROGRAM COMMITTEE Holger Billhardt
Spain
 Universidad Rey Juan Carlos Universidad Politecnica <author> <persName><forename type="first">Luis</forename><surname>Botelho</surname></persName> </author> <imprint> <pubPlace>ISCTE; Lisbon, Portugal</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b6"> <monogr> <title/> <author> <persName><forename type="first">Vicente</forename><surname>Botti</surname></persName> </author> <imprint> <pubPlace>Valencia, Spain</pubPlace> </imprint> <respStmt> <orgName>Universidad Politecnica de</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b7"> <monogr> <title/> <author> <persName><forename type="first">Christiano</forename><surname>Castelfranchi</surname></persName> </author> <imprint> <pubPlace>Italy</pubPlace> </imprint> <respStmt> <orgName>Institute of Cognitive Sciences and Technologies</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b8"> <monogr> <title level="m">Brazil) Carlos Chesnevar
del Sur, Argentina
 Universidade Federal de Pernambuco ; Universidad Nacional Jaelson Castro <author> <persName><forename type="first">John</forename><surname>Debenham</surname></persName> </author> <editor>Frank Dignum</editor> <imprint> <pubPlace>The Netherlands</pubPlace> </imprint> <respStmt> <orgName>University of Technology, Australia ; Universiteit Utrecht</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b10"> <monogr> <title/> <author> <persName><forename type="first">Marc</forename><surname>Esteva</surname></persName> </author> <imprint> <publisher>IIIA-CSIC</publisher> <pubPlace>Spain</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b11"> <monogr> <title/> <author> <persName><forename type="first">Alberto</forename><surname>Fernandez</surname></persName> </author> <author> <persName><forename type="first">;</forename><surname>Juan</surname></persName> </author> <author> <persName><forename type="first">Carlos</forename></persName> </author> <imprint> <publisher>Universidad Rey</publisher> <pubPlace>Spain</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b12"> <monogr> <title/> <author> <persName><forename type="first">Adriana</forename><surname>Giret</surname></persName> </author> <imprint> <pubPlace>, Spain</pubPlace> </imprint> <respStmt> <orgName>Universidad Politecnica de Valencia</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b13"> <monogr> <title/> <author> <persName><forename type="first">Carlos</forename><surname>Angel</surname></persName> </author> <author> <persName><forename type="first">Iglesias</forename></persName> </author> <imprint> <pubPlace>Madrid, Spain</pubPlace> </imprint> <respStmt> <orgName>Universidad Politecnica de</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b14"> <monogr> <title/> <author> <persName><forename type="first">Vicente</forename><surname>Julian</surname></persName> </author> <imprint> <pubPlace>Valencia, Spain</pubPlace> </imprint> <respStmt> <orgName>Universidad Politecnica de</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b15"> <monogr> <author> <persName><forename type="first">Maite</forename><surname>Lopez-Sanchez</surname></persName> </author> <title level="m">Universitat de Barcelona, Spain) Michael Luck
London, UK
 King's College <author> <persName><forename type="first">Peter</forename><surname>Mcburney</surname></persName> </author> <imprint> <pubPlace>Liverpool, UK</pubPlace> </imprint> <respStmt> <orgName>University of</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b17"> <monogr> <author> <persName><forename type="first">Pablo</forename><surname>Noriega</surname></persName> </author> <title level="m">IIIA-CSIC, Spain) Eugenio de Oliveira
Porto, Portugal
 Universidade do <author> <persName><forename type="first">Eva</forename><surname>Onaindia</surname></persName> </author> <imprint> <pubPlace>Valencia, Spain</pubPlace> </imprint> <respStmt> <orgName>Universidad Politecnica de</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b19"> <monogr> <title/> <author> <persName><forename type="first">Sascha</forename><surname>Ossowski</surname></persName> </author> <author> <persName><forename type="first">;</forename><surname>Juan</surname></persName> </author> <author> <persName><forename type="first">Carlos</forename></persName> </author> <imprint> <publisher>Universidad Rey</publisher> <pubPlace>Spain</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b20"> <monogr> <title/> <author> <persName><forename type="first">David</forename><surname>Pearce</surname></persName> </author> <author> <persName><forename type="first">;</forename><surname>Carlos</surname></persName> </author> <imprint> <publisher>IIIA-CSIC</publisher> <pubPlace>Spain; Spain</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b21"> <monogr> <title/> <author> <persName><forename type="first">Maria</forename><surname>Jose</surname></persName> </author> <author> <persName><forename type="first">Ramirez</forename></persName> </author> <imprint> <pubPlace>Valencia, Spain</pubPlace> </imprint> <respStmt> <orgName>Universidad Politecnica de</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b22"> <monogr> <title/> <author> <persName><forename type="first">Juan</forename><surname>Antonio Rodriguez-Aguilar</surname></persName> </author> <imprint> <publisher>IIIA-CSIC</publisher> <pubPlace>Spain</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b23"> <monogr> <title/> <author> <persName><forename type="first">Juan</forename><surname>Manuel</surname></persName> </author> <author> <persName><forename type="first">Serrano</forename></persName> </author> <author> <persName><forename type="first">Juan</forename><surname>Carlos</surname></persName> </author> <imprint> <publisher>Universidad Rey</publisher> <pubPlace>Spain</pubPlace> </imprint> </monogr> </biblStruct> <biblStruct xml:id="b24"> <monogr> <title/> <author> <persName><forename type="first">Jaime</forename><surname>Sichman</surname></persName> </author> <imprint/> <respStmt> <orgName>USP Sao Paulo</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b25"> <monogr> <title/> <author> <persName><forename type="first">Viviane</forename><surname>Torres Da Silva</surname></persName> </author> <imprint> <pubPlace>, UK</pubPlace> </imprint> <respStmt> <orgName>Universidade Federal Flumiense, Brazil) Wamberto Vasconcelos ; University of Aberdeen</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b26"> <monogr> <title/> <author> <persName><forename type="first">Michael</forename><surname>Wooldridge</surname></persName> </author> <imprint> <pubPlace>Liverpool, UK</pubPlace> </imprint> <respStmt> <orgName>University of</orgName> </respStmt> </monogr> </biblStruct> <biblStruct xml:id="b27"> <monogr> <title level="m">An Electronic Institution for simulating water-right markets 9 Semantic Service Discovery in MAS Using Social Networks VicenteBotti AntonioGarrido JuanGimeno AdrianaGiret FrancescIgual PabloNoriega 23 Trust and Belief ElenaDel Val MiguelRebollo VicenteBotti Interrelation 35 <author> <persName><forename type="first">Besik</forename><surname>Dundua</surname></persName> </author> <author> <persName><forename type="first">Levan</forename><surname>Uridia</surname></persName> </author> <imprint/> </monogr> </biblStruct> <biblStruct xml:id="b31"> <monogr> <title level="m" type="main">Behavioral Similarity of Semantic Web Services 43 <author> <persName><forename type="first">Zijie</forename><surname>Cong</surname></persName> </author> <author> <persName><forename type="first">Alberto</forename><surname>Fernández</surname></persName> </author> <imprint/> </monogr> </biblStruct> <biblStruct xml:id="b33"> <monogr> <title level="m" type="main">An Ontology for Formalising Agreement Patterns in Auction Markets JoseJDuran CarlosA