Theoretical Concepts of Group Decision and Negotiation.- Hesitant Fuzzy Linguistic Group Decision Making with Borda Rule.- A Multistage Risk Decision Making Method for Normal Cloud Model with Three Reference Points.- System Portfolio Selection under Hesitant Fuzzy Information.- Decision Support and Behavior in Group Decision and Negotiation Representative Decision-making and the Propensity to Use Round and Sharp Numbers in Preference Specification. -Neuroscience Experiment for Graphical Visualization in the FITradeoff Decision Support System.- Impact of Negotiators’ Predispositions on Their Efforts and Outcomes in Bilateral Online Negotiations.- Some Methodological Considerations for the Organization and Analysis of Inter- and Intra-cultural Negotiation Experiments.- FITradeoff Method for the Location of Healthcare Facilities based on Multiple Stakeholders’ Preferences.- Capturing the Participants’ Voice: Using Causal Mapping supported by Group Decision Software to enhance Procedural Justice.- The Effects of Photographic Images on Agent to Human Negotiations: The Case of the Sicilian Clan.- Applications of Group Decision and Negotiations Analyzing Conflicts of Implementing High-speed Railway Project in Central Asia using Graph Model.- Strategic Negotiation for Resolving Infrastructure Development Disputes in the Belt and Road Initiative.- Attitudinal Analysis of Russia-Turkey Conflict with Chinese Role as a Third-Party Intervention.- Behavioral Modeling of Attackers Based on Prospect Theory and Corresponding Defenders Strategy.- A Multi-Stakeholder Approach to Energy Transition Policy Formation in Jordan.

This book constitutes the refereed proceedings of the 18th International Conference on Group Decision and Negotiation, GDN 2018, held in Nanjing, China, in June 2018. 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 15 full papers presented in this volume were carefully reviewed and selected from 143 submissions. They were organized in topical sections named: theoretical concepts of group decision and negotiation; decision support and behavior in group decision and negotiation; and applications of group decision and negotiations.