Definition
A system or institution declining to act, treated as a capability rather than a failure to answer. It takes one of three forms. Epistemic abstention says the evidence does not support acting on this case and hands it to someone who might know. Jurisdictional abstention says this is not mine to decide and hands it to the party with standing. Remedial abstention says even if I am probably right, acting now would cause harm that reversing the decision later could not undo, and declines until reversal is possible.
It matters because each form is testable and each has a distinct failure mode when absent: epistemic abstention degrades into confident guessing, jurisdictional abstention into scope creep, and remedial abstention into irreversibility. A deployment that cannot abstain in all three forms has no boundary on what it will do with its capability, and exception absorption is what fills the gap.
Tests that show it is in place
- The system can decline an action because its evidence is insufficient, and route the case rather than guess.
- The system can decline because the question belongs to a different decision-maker, and record the referral.
- The system can decline because reversal would be impossible, and state what would make it possible.
Evidence to keep
- Artifact: A refusal taxonomy in the decision record: declined cases carry which abstention applied and why.
- Behavior: A declined consequential action routed to a named alternative decision-maker.
- Metric: Share of declined decisions that record an abstention form, versus silent low-confidence output.
References
- Deliberate non-use · Theory
- STD-01 Temporal Bill of Rights · Standard