TheLatin-AmericanSymposiumonDependable Computing,LADC, isthe main Latin-American event dedicated to the discussion of the many issues related to dependability in computer systems and networks. It is a forum for researchers andpractitionersfromallovertheworldtopresentanddiscusstheirlatestresults andexperiencesinthis?eld. LADC2007,thethirdeditionofthisevent,followed on the success of LADC 2005, which took place in Salvador, Bahia, Brazil, and LADC 2003,which took place at the PolytechnicSchool of the Universityof Sao ˜ Paulo. LADC 2007 wasco-located with the Mexican Annual Computing Conference (ENC), and AdHoc NOW 2007. It was organized by Universidad Auton ´ oma Metropolitana (UAM) and Universidad Nacional Aut´ onoma de M´ exico (UNAM). It was co-sponsored by the Brazilian Computer Society (SBC), the Mexican Society for Computer Science (SMCC), and IEEE TC on Dependable Computing and Fault Tolerance. It was organized in cooperation with IFIP Working Group 10. 4 ‘Dependable Computing and Fault Tolerance,’ the Chilean Computer Science Society (SCCC), and the Argentine Society for Informatics andOperationsResearch(SADIO). LADC2007includedthefollowingactivities: – Five Technical sessions: Fault-Tolerant Algorithms, Software Engineering of Dependable Systems,Networkingand Mobile Computing,Experimental- pendability Evaluation, Intrusion Tolerance and Security – Two keynote speeches: Philip Koopman (CMU, USA), Jean Arlat (LAAS- CNRS, France) – Three tutorials: Lorenzo Alvisi (UT Austin, USA), Eduardo B. Fernandez (FAU, USA), Marco Vieira and Henrique Madeira (U Coimbra, Portugal) – Two panels, chaired by: Henrique Madeira (U Coimbra, Portugal), Rog´ erio de Lemos (U Kent, UK). The latter was a joint panel with AdHoc NOW 2007.