CheckThat! Lab at CLEF 2026

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Task 1: Source Retrieval for Scientific Web Claims

Definition

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.

The data will comprise English, German, and French social media posts.

Datasets

TBA

Evaluation

TBA

Submission

Scorer, Format Checker, and Baseline Scripts

TBA

Submission Site

TBA

Submission Guidelines

TBA

Leaderboard

TBA

Organizers

  • Dimitar Dimtrov, GESIS - Leibniz Institute for the Social Sciences, Cologne, Germany
  • Katarina Boland, Heinrich-Heine-University, Düsseldorf, Germany
  • Konstantin Todorov, LIRMM, CNRS, University of Montpellier, Montpellier, France
  • Salim Hafid, médialab Sciences Po, Paris, France
  • Sebastian Schellhammer, GESIS - Leibniz Institute for the Social Sciences, Cologne, Germany
  • Stefan Dietze, GESIS - Leibniz Institute for the Social Sciences, Cologne, Germany
  • Yavuz Selim Kartal, GESIS - Leibniz Institute for the Social Sciences, Cologne, Germany

Contact

For queries, please join the Slack channel

Alternatively, please send an email to: clef-factcheck@googlegroups.com