Overview of the NTCIR-15 We Want Web with CENTRE (WWW-3) Task

This is an overview of the NTCIR-15 We Want Web with CENTRE (WWW-3) task. The task features the Chinese subtask (adhoc web search) and the English subtask (adhoc web search, replicability and reproducibility), and received 48 runs from 9 teams. We describe the subtasks, data, evaluation measures, and the official evaluation results.