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Can Language Models Reason about Individualistic Human Values and Preferences?

Paper · 2025 · Liwei Jiang, Taylor Sorensen, Sydney Levine et al.

Summary

The paper argues that pluralistic alignment usually sorts people into predefined groups such as demographics, personality, or culture. That approach can erase individual differences and invite stereotyping. The authors propose individualistic alignment instead and focus on one concrete part of it: individualistic value reasoning. Here a model sees some of a person's value statements and must infer how that person would judge new questions. To support this task, they convert the World Values Survey (WVS) into IndieValueCatalog. Its varied questions and answer formats become uniform first-person natural-language statements, available at two granularities (refined and polarity-grouped). Frontier LMs score only about 55–65% zero-shot. Adding demographic information to the value statements helps strong models very little, so group labels cannot replace individual evidence. The authors also introduce the Value Inequity Index (σINEQUITY), which shows that models perform unevenly across population groups. Finally, they fine-tune IndieValueReasoner models, which improve both accuracy and equity on held-out people. These experiments also reveal patterns in global human values.

Key points

  • Dataset scale: IndieValueCatalog covers 93,279 WVS respondents from 70+ countries.
    • 253 questions map to 929 refined or 567 polar statements.
    • Each person has on average about 242 value statements plus 31 demographic statements.
  • Evaluation setup:
    • Demonstrations range from 50 to 200 statements per person.
    • Probes cover 39 statements across 13 WVS categories.
    • Results are averaged over three cross-validation splits.
    • 800 demographically balanced individuals are held out for testing.
  • Baseline performance: Frontier LMs reach only 55–65% zero-shot accuracy at predicting an individual's value choices.
  • Role of demographics: Supplying demographic statements gives only marginal gains, which cautions against defining people by group membership.
  • Fairness and training: The Value Inequity Index (σINEQUITY) exposes uneven treatment across groups. IndieValueReasoner models, trained with Open-Instruct, improve both accuracy and σINEQUITY.

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

 Fields, topics and concepts

Cite

Cite as Liwei Jiang, Taylor Sorensen, Sydney Levine and Yejin Choi. 2025. Can Language Models Reason about Individualistic Human Values and Preferences?. Proceedings of the 63rd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers).

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.18653/v1/2025.acl-long.336

@inproceedings{jiang2025can,
  title = {{Can Language Models Reason about Individualistic Human Values and Preferences?}},
  author = {Liwei Jiang, Taylor Sorensen, Sydney Levine and Yejin Choi},
  booktitle = {Proceedings of the 63rd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
  year = {2025},
  doi = {10.18653/v1/2025.acl-long.336},
  url = {https://doi.org/10.18653/v1/2025.acl-long.336}
}

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