The purpose of the IC3K is to bring together researchers, engineers and practitioners on the areas of Knowledge Discovery, Knowledge Engineering and Knowledge Management. IC3K is composed of three co-located conferences, each specialized in at least one of the aforementioned main knowledge areas.        KDIRInternational Conference on Knowledge Discovery and Information RetrievalProgram ChairAna Fred, Technical University of Lisbon / IT, Portugal                                                                                           KEODInternational Conference on Knowledge Engineering and Ontology Development Program ChairJan Dietz, Delft University of Technology, Netherlands                                                                KMISInternational Conference on Knowledge Management and Information SharingProgram ChairKecheng Liu, University of Reading, United KingdomImportant DatesRegular Paper Submission: April 30, 2012 (extended)Authors Notification (regular papers): June 12, 2012Final Regular Paper Submission and Registration: July 4, 2012 2012 Keynote SpeakerDaniel O'Leary, University of Southern California, United StatesIc3k Secretariat Address: Av. D. Manuel I, 27A, 2º esq., 2910-595 Setúbal - PortugalTel.: +351 265 100 033Fax: +44 203 014 8639