Legal openness
The degree to which the disposition of a legal question depends on who decides it rather than on the legal materials, measured as the instability of a ruling when the law is held fixed and only judicial posture varies.
First used in Ariadne's Thread
Legal openness is the construct that Posture Dispersion (Z) operationalizes. It turns the old dispute over legal determinacy into a measurement problem. Rather than assume, with Dworkin, that right answers exist, or with the strong indeterminacy thesis that they pervasively do not, the method measures how open each question is and lets the distribution speak.
The number is jurisprudentially ecumenical. A positivist reads high openness as a zone where the legal materials leave discretion to the judge; a Dworkinian may read it as a place where the instrument has not yet found the best interpretation. The number is the same; the gloss differs.
Openness is distinct from textual ambiguity, which is a property of words, and from outcome unpredictability, which mixes the openness of the law with the quality of features and training data.
Related terms
Related frameworks
Posture Dispersion (Z)
Hold verified law fixed, vary only the judicial posture across a declared panel, subtract the instrument's own replicate noise, and the normalized dispersion that remains, Z, measures how open a procedural question is.
Grayness Score and Gray Area Radar
The Grayness Score is a composite, evidence-linked indicator of how far the legal system itself treats a question as contested, and the Gray Area Radar is the view that shows a lawyer which signals fired and where they came from.