Torgo, Luís, Matwin, Stan, Weiss, Gary, Moniz, Nuno, Branco, Paula,
This volume contains the Proceedings of the International Workshop on Cost-SensitiveLearning - COST’2018. This workshop was co-organized by the Laboratory of ArtificialIntelligence and Decision Support (INESC TEC), the Department of Computer Sciencein Faculty of Sciences of Porto University (Portugal), the Faculty of Computer Science ofDalhousie University and the Department of Computer and Information Science in FordhamUniversity. The workshop was co-located with theSIAM: International Conference on DataMining(SDM) 2018 and was held on the 5th of May 2018 in the San Diego Marriott MissionValley, San Diego, California, USA.