Version History & Releases

Name: International Sovereignty Index (ISI) — EU-27 Founding Cohort
Published: 2026-02-01
License: https://creativecommons.org/licenses/by/4.0/

Chronological record of dataset releases, methodology revisions, and schema changes for the International Sovereignty Index. All versions are permanently archived through Zenodo.

Dataset Releases

v1.0.0

Latest

Founding release — 27 EU member states assessed across 6 strategic dependency axes.

2026-02-01

Cohort: EU-27 · Data window: 2024

Changelog

Initial publication of composite ISI scores for all EU-27 member states
Six-axis HHI framework: Financial, Energy, Technology, Defense, Critical Inputs, Logistics
Bilateral channel-level supplier concentration data from 12+ primary sources
Scenario simulation engine with ±20% axis perturbation

CSV JSON API Endpoint

Methodology Versions

Retrieved from the ISI backend. Each methodology version defines axis weights, scoring rules, and classification thresholds.

Version	Label	Frozen At	Axes	Aggregation	Years
v1.0	ISI Baseline Methodology — Unweighted HHI Mean	2026-02-21T00:00:00+00:00	6	unweighted_arithmetic_mean	2024
v1.1	ISI Global Expansion Phase 1 — Variable-Axis HHI Mean	2026-03-21T00:00:00+00:00	6	unweighted_arithmetic_mean	2024

Schema & API Stability

Versioning: Dataset versions follow semantic versioning (MAJOR.MINOR.PATCH). Breaking schema changes increment the major version.
API endpoints: The /api/data/isi and /api/data/country/[code] endpoints include versioned metadata (dataset version, methodology version) for forward compatibility.
Backward compatibility: Additive fields (new axes, additional metadata) do not constitute breaking changes and are handled via minor version increments.
Archival: Each dataset release is archived on Zenodo with a persistent DOI. Historical versions remain available for reproducibility.

Cite: Drazsky, S., & International Sovereignty Institute. (2026). International Sovereignty Index (ISI) — EU-27 Founding Cohort (v1.0). Zenodo. https://doi.org/10.5281/zenodo.18764170

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