DnDScore: Decontextualization and Decomposition for Factuality Verification in Long-Form Text Generation

Miriam Wanner, Benjamin Van Durme, Mark Dredze


Abstract
The decompose-then-verify strategy for verification of Large Language Model (LLM) generations decomposes claims that are then independently verified. Decontextualization augments text (claims) to ensure it can be verified outside of the original context, enabling reliable verification. While decomposition and decontextualization have been explored independently, their interactions in a complete system have not been investigated. Their conflicting purposes can create tensions: decomposition isolates atomic facts while decontextualization inserts relevant information. Furthermore, a decontextualized subclaim presents a challenge to the verification step: what part of the augmented text should be verified as it now contains multiple atomic facts? We conduct an evaluation of different decomposition, decontextualization, and verification strategies and find that the choice of strategy matters in the resulting factuality scores. Additionally, we introduce DnDScore, a decontextualization aware verification method that validates subclaims in the context of contextual information.
Anthology ID:
2025.emnlp-main.1205
Volume:
Proceedings of the 2025 Conference on Empirical Methods in Natural Language Processing
Month:
November
Year:
2025
Address:
Suzhou, China
Editors:
Christos Christodoulopoulos, Tanmoy Chakraborty, Carolyn Rose, Violet Peng
Venue:
EMNLP
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Publisher:
Association for Computational Linguistics
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Pages:
23620–23637
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URL:
https://preview.aclanthology.org/ingest-emnlp/2025.emnlp-main.1205/
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Cite (ACL):
Miriam Wanner, Benjamin Van Durme, and Mark Dredze. 2025. DnDScore: Decontextualization and Decomposition for Factuality Verification in Long-Form Text Generation. In Proceedings of the 2025 Conference on Empirical Methods in Natural Language Processing, pages 23620–23637, Suzhou, China. Association for Computational Linguistics.
Cite (Informal):
DnDScore: Decontextualization and Decomposition for Factuality Verification in Long-Form Text Generation (Wanner et al., EMNLP 2025)
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