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We describe the third edition of the CheckThat! Lab, which is part of the2020 Cross-Language Evaluation Forum (CLEF). CheckThat! proposes fourcomplementary tasks and a related task from previous lab editions, offered inEnglish, Arabic, and Spanish. Task 1 asks to predict which tweets in a Twitterstream are worth fact-checking. Task 2 asks to determine whether a claim postedin a tweet can be verified using a set of previously fact-checked claims. Task3 asks to retrieve text snippets from a given set of Web pages that would beuseful for verifying a target tweet's claim. Task 4 asks to predict theveracity of a target tweet's claim using a set of Web pages and potentiallyuseful snippets in them. Finally, the lab offers a fifth task that asks topredict the check-worthiness of the claims made in English political debatesand speeches. CheckThat! features a full evaluation framework. The evaluationis carried out using mean average precision or precision at rank k for rankingtasks, and F1 for classification tasks.

CheckThat! at CLEF 2020: Enabling the Automatic Identification and Verification of Claims in Social Media