The Closure Problem in Discourse Ethics: Ecological Truth and the Limits of the Tripartite Model

Discourse ethics rests on the assumption that validity claims fall into a closed triad: facts about the objective world, norms about the intersubjective world, and self‐expressions disclosing the subjective world. This paper challenges that assumption. I argue that the tripartite framework is not exhaustive, and that treating it as such generates a previously unrecognized form of exclusion: not at the level of access, power, or expression, but at the level of intelligibility itself. To make this case, I introduce “ecological truth” as a candidate for a distinct kind of validity claim. Drawing on examples from place‐based discursive practices, I suggest that such claims are plausibly neither factual, normative, nor self‐expressive, but exhibit a different structure of validity grounded in long‐term ecological relationships and practices of attunement. I then propose criteria for recognizing new kinds of validity claims and show that ecological truth plausibly satisfies them. The plausibility of ecological truth as a distinct validity claim gives us reason to think that the tripartite model should not be treated as closed. Instead, validity claims are better understood as forming a more complex conceptual space, within which additional forms of reason‐giving may exist. If so, discourse ethics must revise its foundational categories if it is to adequately account for the full range of meaningful contributions to deliberation.