Advances in Bias, Fairness, and Understudied Users in Information Retrieval

This book constitutes the conference proceedings of 6th International Workshop on Algorithmic Bias in Search and Recommendation, BIAS 2025 and 2nd International Workshop on Information Retrieval for Understudied Users, IR4U2, held in Padua, Italy, on July 17, 2025.For BIAS 2025, 3 full papers were carefully reviewed and selected from 7 submissions. They focus on data preparation, countermeasure de...