From June 2-5, the 24th conference on Group Decision and Negotiation (GDN) took place in Porto, jointly with the ICDSST conference organized by EWG-DSS. Papers submitted to the GDN conference are typically published in two types of post-conference proceedings: local proceedings, published by the organizer (in 2024, the University of Porto), and Springer proceedings, published as part of the Lecture Notes in Business Information Processing (LNBIP) series. The co-editor of this year's GDN LNBIP volume (No. 509) was Professor Tomasz Wachowicz, and the entire editorial team included Marta Campos Fereira (University of Porto), Pascale Zarate (University of Toulouse), and Yu Maemura (University of Tokyo). Conference participants received free four-month electronic access to the volume. It is also available for purchase on the publisher's website: https://link.springer.com/book/10.1007/978-3-031-59373-4

The volume includes 13 papers grouped into three thematic tracks: (1) Conflict Resolution; (2) Preference Modeling for Group Decision and Negotiation; and (3) Collaborative and Responsible Negotiation Support Systems and Studies. The table of contents is as follows:

• Conflict Resolution
  
  1. An Analysis of the Predatory Fishing Conflict During the Piracema Period Through the Graph Model (Raí dos Santos Mota, Maísa Mendonça Silva, and Leandro Chaves Rêgo)
  2. Uncertainty and Information Asymmetry in Underground Works: A Case Study (Muhammad Tajammal Khan and Masahide Horita)
  3. Developing a Multi-phase Stakeholder Game Framework for Recyclable Resource Management System (Jing Ma, Dongbin Wang, Haimei Li, and Zhengbing Guo)
  4. Hybrid Evolutionary Approach to Team Building using PROMETHEE II (Georgios Stavrou, Panagiotis Adamidis, Jason Papathanasiou,
     and Konstantinos Tarabanis)
• Preference Modeling for Group Decision and Negotiation
  
  1. The Enhanced TOPSIS with Application to the Evaluation of Negotiation Offers Outside Feasible Negotiation Space (Tomasz Wachowicz and Ewa Roszkowska)
  2. A Stratified Fuzzy Group Best Worst Decision-Making Framework (Yanlin Li, Y. P. Tsang, C. K. M. Lee, and Yipu Yao)
  3. Selection of Rapid Classifier Development Methodology Used to Implement a Screening Study Based on Children’s Behavior During
     School Lessons (Grzegorz Dziczkowski, Tomasz Jach, Barbara Probierz, Piotr Stefanski, and Jan Kozak)
  4. Upper Performance Limits and Distribution Invariance for Surrogate Weights in MCDA (Sebastian Lakmayer, Mats Danielson, and Love Ekenberg)
  5. Evaluation of the Degree of Manipulability of Positional Aggregation Procedures in a Dynamic Voting Model (Daniel Karabekyan and Viacheslav Yakuba)
• Collaborative and Responsible Negotiation Support Systems and Studies
  1. Negotiation Platform for Supporting Multi-issue Bilateral Negotiations: The Case of an OffshoreWind Energy Company and a Fishing Community
     in the Northeast of Brazil (Eduarda Asfora Frej, Gabriela Silva da Silva, Maria Luiza da Silva, and Danielle Costa Morais)
  2. Allocation of Recurring Fixed Costs According to Partners’ Varying Revenues in Professional Services (Eugene Khmelnitsky and Yigal Gerchak)
  3. Examining the Effect of ChatGPT on Small Group Ideation Discussions (Madoka Chosokabe, Shohei Koie, and Yuji Oyamada)
  4. Full Rank Voting: The Closest to Voting with Intensity of Preferences (Luis G. Vargas and Marcel C. Minutolo)

On behalf of the editors, we wish everyone an enjoyable read.