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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-third issue contains 14 carefully selected and revised contributions.

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Robustness of Legislative Procedures of the Italian Parliament.- Approval Voting as a Method of Prediction in Political Votings. Case of Polish elections.- The Complexity of Voter Control and Shift Bribery under Parliament Choosing Rules.- National Interests in the European Parliament: Roll Call Vote Analysis.- Voting and Communication when Hiring by Committee.- Power Measures and Public Goods.- Holdout Threats During Wage Bargaining.- Index of implicit power as a measure of reciprocal ownership.- Manipulability Of Voting Procedures: Strategic Voting And Strategic Nomination.- Reflections on the Signifcance of Misrepresenting Preferences.- Fibonacci representations of homogeneous weighted majority games.- Towards a fairness-oriented approach to consensus reaching support under fuzzy preferences and a fuzzy majority via linguistic summaries?.- What Is It That Drives Dynamics: We Don´t Believe in Ghosts, Do We?.

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