Attitude-Based Consensus Model for Heterogeneous Group Decision Making R. M. Rodríguez, I. Palomares and L. Martínez Abstract Usually, human beings make decisions in their daily life providing their preferences according to their knowledge area and background. Therefore, when a high number of decision makers take part in a group decision-making problem, it is usual that they use different information domains to express their preferences. Besides, it might occur that several subgroups of decision makers have different interests, which may lead to situations of disagreement amongst them. Therefore, the integration of the group’s attitude toward consensus might help optimizing the consensus reaching process according to the needs of decision makers. In this contribution, we propose an attitude-based consensus model for heterogeneous group decision-making problems with large groups of decision makers. Keywords Group decision making  Heterogeneous information  Attitude  Consensus reaching 1 Introduction Decision making is a usual process for human beings in their daily life. In group decision-making (GDM) problems, a group of decision makers try to reach a solution to a problem that consists of a set of possible alternatives, providing their preferences [3]. An important aspect in GDM problems is to achieve a common solution which is accepted by all decision makers involved in the problem. R. M. Rodríguez (&)  I. Palomares  L. Martínez Department of Computer Science, University of Jaén, Campus Las Lagunillas, s/n. 23071, Jaén, Spain e-mail: rmrodrig@ujaen.es I. Palomares e-mail: ivanp@ujaen.es L. Martínez e-mail: martin@ujaen.es F. Sun et al. (eds.), Knowledge Engineering and Management, Advances in Intelligent Systems and Computing 214, DOI: 10.1007/978-3-642-37832-4_26, Ó Springer-Verlag Berlin Heidelberg 2014 279