Aggregating value systems for decision support

Roger X. Lera-Leri*, Enrico Liscio, Filippo Bistaffa, Catholijn M. Jonker, Maite Lopez-Sanchez, Pradeep K. Murukannaiah, Juan A. Rodriguez-Aguilar, Francisco Salas-Molina

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

27 Downloads (Pure)


We adopt an emerging and prominent vision of human-centred Artificial Intelligence that requires building trustworthy intelligent systems. Such systems should be capable of dealing with the challenges of an interconnected, globalised world by handling plurality and by abiding by human values. Within this vision, pluralistic value alignment is a core problem for AI– that is, the challenge of creating AI systems that align with a set of diverse individual value systems. So far, most literature on value alignment has considered alignment to a single value system. To address this research gap, we propose a novel method for estimating and aggregating multiple individual value systems. We rely on recent results in the social choice literature and formalise the value system aggregation problem as an optimisation problem. We then cast this problem as an ℓp-regression problem. Doing so provides a principled and general theoretical framework to model and solve the aggregation problem. Our aggregation method allows us to consider a range of ethical principles, from utilitarian (maximum utility) to egalitarian (maximum fairness). We illustrate the aggregation of value systems by considering real-world data from two case studies: the Participatory Value Evaluation process and the European Values Study. Our experimental evaluation shows how different consensus value systems can be obtained depending on the ethical principle of choice, leading to practical insights for a decision-maker on how to perform value system aggregation.

Original languageEnglish
Article number111453
Number of pages14
JournalKnowledge-Based Systems
Publication statusPublished - 2024


  • AI & ethics
  • Optimisation
  • Value systems


Dive into the research topics of 'Aggregating value systems for decision support'. Together they form a unique fingerprint.

Cite this