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What is Truth in NLP? Reflecting on Progress, Lessons, and Open Challenges as NLPerspectives turns Five

This paper reflects on five years of the Workshop on Perspectivist Approaches to NLP (NLPerspectives) and examines how this research community has helped to reconceptualise the notion of ground truth in human-labelled data. As NLP research has increasingly engaged with social and affective tasks, traditional assumptions about annotation reliability–centred on inter-annotator agreement and single ‘gold standard’ labels–have proven insufficient for capturing the genuine diversity of human perspectives. I review the developments that have driven the ‘Perspectivist Turn,’ assess its influence on mainstream NLP practice, and highlight the methodological challenges that arise when modelling disagreement, subjectivity, and annotator variation. In particular, I consider unresolved questions around evaluation paradigms, task formulation, population representation, community norms, and the implications of using pre-trained generative models as classifiers. By synthesising discussions from five years of workshops, keynotes, and related publications, I outline open challenges and propose directions for future work aimed at more rigorous perspectivist NLP. I argue that we should focus on centering minoritised standpoints and caution against viewing potentially harmful interpretations as equally legitimate reactions to ‘subjective’ phenomena.