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.