In creating urban space, there is always an exchange of dialogue as to what the space currently is and how it ought to exist, by those who live in that place, those who have a stake in its future, and those who sense the need for improvement in its harsh reality. Some of their thoughts materialize in the form of a physical change to the current environment - and urban regene- tion is one such form. This process in which people redefine their living environment and socially reconstruct the meaning and value of a place is all too important in deciding what, if any, change should be introduced in the form of a physical project. Some might argue that this communicative process is indeed the very core or even the definition of urban regeneration rather than a mere condition for instigation. However, it has also been observed that such a communicative process is often difficult to manage, if it happens at all. Social exclusion, power imbalance, conflict, indifference, and lack of c- municative social capital are the usual suspects in collective inaction, but it is also true that they are familiar constituents of any urban life. In some social contexts, little attention has been paid to such complexity.

In creating urban space, there is always an exchange of dialogue as to what the space currently is and how it ought to exist, by those who live in that place, those who have a stake in its future, and those who sense the need for improvement in its harsh reality. Some of their thoughts materialize in the form of a physical change to the current environment - and urban regene- tion is one such form. This process in which people redefine their living environment and socially reconstruct the meaning and value of a place is all too important in deciding what, if any, change should be introduced in the form of a physical project. Some might argue that this communicative process is indeed the very core or even the definition of urban regeneration rather than a mere condition for instigation. However, it has also been observed that such a communicative process is often difficult to manage, if it happens at all. Social exclusion, power imbalance, conflict, indifference, and lack of c- municative social capital are the usual suspects in collective inaction, but it is also true that they are familiar constituents of any urban life. In some social contexts, little attention has been paid to such complexity.

This book constitutes the refereed proceedings of the 23rd International Conference on Group Decision and Negotiation, GDN 2023, which took place in Tokyo, Japan during June 11–15, 2023.The field of Group Decision and Negotiation focuses on decision processes with at least two participants and a common goal but conflicting individual goals. Research areas of Group Decision and Negotiation include electronic negotiations, experiments, the role of emotions in group decision and negotiations, preference elicitation and decision support for group decisions and negotiations, and conflict resolution principles. This year’s conference focusses on multimodal interactions. The 11 full papers presented in this volume were carefully reviewed and selected from 102 submissions. They were organized in the following topical sections: Taking a step back: Critically re-examining technology interactions with group decision and negotiation; preference modeling and multi-criteria decision-making; and conflict modeling and distributive mechanisms.

This book constitutes the refereed proceedings of the 21st International Conference on Group Decision and Negotiation, GDN 2021, which was planned to be held in Toronto, ON, Canada, during June 6-10, 2021. The conference was held virtually due to the COVID-19 pandemic.The field of Group Decision and Negotiation focuses on decision processes with at least two participants and a common goal but conflicting individual goals. Research areas of Group Decision and Negotiation include electronic negotiations, experiments, the role of emotions in group decision and negotiations, preference elicitation and decision support for group decisions and negotiations, and conflict resolution principles. The 12 full papers presented in this volume were carefully reviewed and selected from 74 submissions. They were organized in topical sections as follows: pandemic responses; preference modeling for group decision and negotiation; conflict resolution; and collaborative decision making processes.

This book constitutes the refereed proceedings of the 20th International Conference on Group Decision and Negotiation, GDN 2020, which was planned to be held in Toronto, ON, Canada, during June 7-11, 2020. The conference was cancelled due to the Coronavirus pandemic. Nevertheless, it was decided to publish the proceedings, because the review process had already been completed at the time the cancellation was decided. The field of Group Decision and Negotiation focuses on decision processes with at least two participants and a common goal but conflicting individual goals. Research areas of Group Decision and Negotiation include electronic negotiations, experiments, the role of emotions in group decision and negotiations, preference elicitation and decision support for group decisions and negotiations, and conflict resolution principles. The 14 full papers presented in this volume were carefully reviewed and selected from 75 submissions. They were organized in topical sections named: Conflict Resolution, Preference Modeling for Group Decision and Negotiation, Intelligent Group Decision Making and Consensus Process, Collaborative Decision Making Processes.