Connectionists: CLEF-2026 CheckThat! Lab -- 3rd Call for Participation

[Julia Maria Struß]

(apologies for cross-posting)


Dear colleague,


We invite you to participate in the 2026 edition of the CheckThat! Lab 
at CLEF 2026. This year, we feature three tasks ---two follow-up and one 
new--- that correspond to important components within and around the 
full fact-checking pipeline in multiple languages:


Task 1 Source Retrieval for Scientific Web Claims: Given a social media 
post that contains a scientific claim and an implicit reference to a 
scientific paper (mentions it without a URL), retrieve the mentioned 
paper from a pool of candidate papers. Available in English, German, and 
French.


Task 2 Fact-Checking Numerical Claims:Given claims, potential evidence, 
and possible reasoning paths, rank the reasoning paths and provide an 
output of verdict. Available in Arabic, English, and Spanish.


Task 3 Generating Full Fact-Checking Articles:Given a claim, its 
veracity, and a set of evidence documents consulted for fact-checking 
the claim, generate a full fact-checking article.


Register and participate:https://clef-labs-registration.dipintra.it/ 
<https://clef-labs-registration.dipintra.it/>

Further information:https://checkthat.gitlab.io/ 
<https://checkthat.gitlab.io/>

Datasets:https://gitlab.com/checkthat_lab/clef2026-checkthat-lab 
<https://gitlab.com/checkthat_lab/clef2026-checkthat-lab>(training and 
validation materials released)

Discord Server: https://discord.gg/PEMh4a2YHV 
<https://discord.gg/PEMh4a2YHV>



Important Dates

---------------------

- 23 April 2026: Lab registration closes

- 24 April 2026: Beginning of the evaluation cycle (test sets release)

- 7 May 2026 (23:59 AOE): End of the evaluation cycle (run submission)

- 28 May 2026: Deadline for the submission of working notes [CEUR-WS]

- 29 May – 27 June 2026: Review process of participant papers

- 30 June 2026: Notification of Acceptance for working notes [CEUR-WS]

- 6 July 2026: Camera Ready Copy of working note papers [CEUR-WS]

- 10 July 2026: Regular Conference Registration Ends

- 31 August 2026: Late Conference Registration Ends

- 21-24 September 2026: CLEF 2026 Conference in Jena, Germany



Best regards,

The CLEF-2026 CheckThat! Lab Shared Task Organizers


-- 
___________________________
Prof. Dr. Julia Maria Struß

Fachhochschule Potsdam
University of Applied Sciences
Fachbereich Informationswissenschaften
Kiepenheuerallee 5
14469 Potsdam
Telefon: +49 331 580 4532
Zoom:https://fh-potsdam.zoom-x.de/my/juliamstruss
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