Voting Systems in Theory and Practice -- Optimization-Based Voting Rule Design: The Closer to Utopia the Better -- A Procedure for Multiattribute Reverse Auctions with two Strategic Parameters -- Aggregation of Stochastic Rankings in Group Decision Making -- Quantitative Measures for Recognition of Negotiation Style and Activity -- How Well Agents Represent their Principals' Preferences: The Effect of Information Processing, Value Orientation, and Goals -- Automated Decision Systems: Why Human Autonomy is at Stake -- Supporting Users' Utilitarian Needs for Systems in Online Negotiations -- Setting the Right Tone: The Role of Language Sentiment in E-negotiations -- Mathematical Based Models for Group Decision Support in Telecommunication Network Design and Management - Challenges and Trends -- Group Decision Process for Evaluating a Mango Variety to be Planted in New Agricultural Farms.

This book is a token of appreciation for Professor Gregory E. Kersten (1949-2020), one of the most prominent and active researchers and scholars in the broadly perceived field of collective decisions, notably negotiations, the author of numerous influential papers, books, and edited volumes, a great scientist, mentor, and a loyal friend and colleague. This book contains some papers in the fields of group and collective decisions, voting, social choice, negotiations, and related topics, with examples of real applications. The authors are top researchers and scholars from all over the world whose life and academic career has been inspired and influenced by Professor Kersten.