This paper provides an overview of the NTCIR-18 FairWeb-2 Task. Our task considers not only document relevance but also group fairness. We designed two subtasks: the Web Search Subtask, and the Conversational Search Subtask. We designed three types of search topics for this task: researchers (R), movies (M), and Youtube contents (Y). For each topic type, attribute sets are defined for considering group fairness. For the Web Search Subtask, we received 23 runs from five teams, including six runs from the organisers team. For the Conversational Search Subtask, we received four runs from two teams, including one run from the organisers team. In this paper, we describe the task, the test collection construction and the official evalution results of the submitted runs.
Tao et al. (2025) studied this question.