This paper provides an overview of eRisk 2020, the fourth edition of this lab under the CLEF conference. The main purpose of eRisk is to explore issues of evaluation methodology, effectiveness metrics and other processes related to early risk detection. Early detection technologies can be employed in different areas, particularly those related to health and safety. This edition of eRisk had two tasks. The first task focused on early detecting signs of self-harm. The second task challenged the participants to automatically filling a depression questionnaire based on user interactions in social media.
Keywords: early risk, evaluation, test collections, self-harm, depression