From Notice to Contestable Grounds

Preprint · 15 October 2026

From Notice to Contestable Grounds: Necessary Informational Conditions for Algorithmic Contestability

Kerry Thornhill

Anuradha and Vikas Sinha College of Artificial Intelligence and Advanced Analytics, University of North Texas

DOI

10.5281/zenodo.23387270

Repository

Zenodo

Format

PDF · 22 pages

License

CC BY 4.0

Read the full paper (PDF) ↓View on Zenodo ↗

Abstract

Notice, explanation, and an appeal procedure can leave an affected party unable to investigate an institution’s determination. Where contestability is independently required or promised, this article develops the Necessary Informational Conditions framework to identify what information must enable. It connects a material objection to the question that must be answered, the operations that could answer it, and a test of whether any adequate route can dispense with a candidate operation. Six functions organize the inquiry: determination and consequence; sociotechnical roles and evidence control; data, source, and quality; governing-standard–operation fit; evidential warrant, uncertainty, and threshold; and contextual applicability. Necessity is conditional on the task, an independently justified adequacy floor, and the feasible routes compared. Different documents or expert arrangements may perform the same operation; an adequate route that omits it defeats its necessity. The framework also specifies arrangements for making the work possible: baseline orientation, contemporaneous preservation, inquiry-activated access, protected mediation, and usable support. These must let affected parties discover what warrants investigation before they are expected to substantiate an objection. Meaningful contestability also requires timely institutional consideration through which evidence and reasons can affect the determination. K.W. v. Armstrong illustrates how obstacles to inquiry and review can interact. A proposed research program tests omission and substitution, compares rival classifications, and develops a contestability toolkit. The contribution is a common framework for diagnosing failures of inquiry, comparing remedies, and designing procedures through which affected people and their representatives can investigate consequential judgments and bring evidence and reasons to bear on them.

Keywordsalgorithmic contestability · informational conditions · institutional decision-making · evidentiary access · accountability · functional necessity

Key contributions

1. A task-centered account of informational necessity. The framework’s central innovation is to organize informational necessity around epistemic tasks: the work needed to assess a material objection.
2. A register of six candidate informational functions. Determination and consequence; sociotechnical roles and evidence control; data, source, and quality; governing-standard–operation fit; evidential warrant, uncertainty, and threshold; and contextual applicability.
3. A test of conditional necessity. Necessity is conditional on the task, an independently justified adequacy floor, and the feasible routes compared; an adequate route that omits an operation defeats its necessity.
4. A delivery architecture. Baseline orientation, contemporaneous preservation, inquiry-activated access, protected mediation, and usable support, so that people need not prove a hidden defect before they can obtain the information needed to investigate it.
5. A path to empirical testing. A proposed research program tests omission and substitution, compares rival classifications, and develops a contestability toolkit.

Contents of the paper

1. Notice without contestable grounds
2. From explanation to investigative capability
3. Object, standpoint, and scope
4. Conditional functional necessity
5. Staged availability of contestable grounds
6. Six informational functions
7. K.W. v. Armstrong as a structured demonstration
8. Objections and boundary conditions
9. Making the register empirically vulnerable
10. Conclusion

How to cite

@misc{thornhill_2026_23387270,
  author    = {Thornhill, Kerry},
  title     = {From Notice to Contestable Grounds: Necessary Informational Conditions for Algorithmic Contestability},
  month     = oct,
  year      = 2026,
  publisher = {Zenodo},
  doi       = {10.5281/zenodo.23387270},
  url       = {https://doi.org/10.5281/zenodo.23387270}
}