CheckThat! Lab at CLEF 2023





Checkworthiness, Subjectivity, Political Bias, Factuality, and Authority of News Articles and Their Sources


  • Task 1 Check-Worthiness in Multimodal and Unimodal Contents
  • Task 2 Subjectivity in News Articles
  • Task 3 Political Bias of News Articles and News Media
  • Task 4 Factuality of Reporting of News Media
  • Task 5 Authority Finding in Twitter

Lab Registration

The lab registration is done through the CLEF 2023 website.

Recent Updates

  • 10th March, 2023: Dataset released for task 2 (Arabic, German, Turkish)!
  • 6th March, 2023: Dataset released for task 3 and 4!
  • 8th February, 2023: Dataset released for task 1B!
  • 20th December, 2022: Dataset released for task 1A!
  • 1st November, 2022: The website is up!

Important Dates

(notice that the timing is still tentative)

  • November 2022: Lab registration opens
  • December 2022: Release of the training materials
  • April 2023: Lab registration closes
  • May 2023: Beginning of the evaluation cycle
  • May 2023: End of the evaluation cycle (run submission)
  • May 2023: Deadline for the submission of working notes
  • June 2023: Notification of acceptance of working notes
  • July 2023: Deadline for submission of camera-ready working notes
  • July 2023: Preview of working notes
  • 18-21 September: CLEF 2023 Conference in Thessaloniki


There are two channels for discussion and doubts:

Please join our discussion group to receive announcements and participate in discussions.

A slack channel is available as well.



The papers associated to this edition will be public during the summer of 2023.

CLEF 2023

This edition of the CheckThat! lab is held within CLEF 2023, part of the CLEF initiative.