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These transactions publish research in computer-based methods of computational collective intelligence (CCI) and their applications in a wide range of fields such as the semantic Web, social networks, and multi-agent systems. TCCI strives to cover new methodological, theoretical and practical aspects of CCI understood as the form of intelligence that emerges from the collaboration and competition of many individuals (artificial and/or natural). The application of multiple computational intelligence technologies, such as fuzzy systems, evolutionary computation, neural systems, consensus theory, etc., aims to support human and other collective intelligence and to create new forms of CCI in natural and/or artificial systems. This twenty-seventh issue is a special issue with 13 selected papers from the Second Seminar on Quantitative Methods of Group Decision Making.

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Kalai-Smorodinsky Balances for n-Tuples of Interfering Elements.- Reason vs. Rationality: From Rankings to Tournaments in Individual Choice.- A Note on Positions and Power of Players in Multicameral Voting Games.- On Ordering a Set of Degressively Proportional Apportionments.- Preorders in Simple Games.- Sub-coalitional approach to values.- The Effect of Brexit on the Balance of Power in the European Union Council: An Approach Based on Pre-coalitions.- Comparison of voting methods used in some classical music competitions.- Determinants of the perception of opportunity.- Free-riding in Common Facility Sharing.- Simulating Crowd Evacuation with Socio-Cultural, Cognitive, and Emotional Elements.- Group Approximation of Task Duration and Time Buffers in Scrum.- Inspirations.

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