Résumé
The CheckThat! lab aims to advance the development of innovative technologies
designed to identify and counteract online disinformation and manipulation
efforts across various languages and platforms. The first five editions focused
on key tasks in the information verification pipeline, including
check-worthiness, evidence retrieval and pairing, and verification. Since the
2023 edition, the lab has expanded its scope to address auxiliary tasks that
support research and decision-making in verification. In the 2025 edition, the
lab revisits core verification tasks while also considering auxiliary
challenges. Task 1 focuses on the identification of subjectivity (a follow-up
from CheckThat! 2024), Task 2 addresses claim normalization, Task 3 targets
fact-checking numerical claims, and Task 4 explores scientific web discourse
processing. These tasks present challenging classification and retrieval
problems at both the document and span levels, including multilingual settings.