Sovereignty is a property of the weakest link.

The EDSO overall level of a service is the minimum of the four domain levels.

EDSO does not add, does not average and does not weight. The choice of the minimum function is not an aesthetic but a structural decision. Sovereignty behaves like functional safety: a SIL chain is only as strong as its weakest link. A bridge with three strong pillars and one weak one is a weak bridge — regardless of how load-bearing the other three are.

Averaging would render weaknesses invisible in aggregation. A service with D1 = L3, D2 = L3, D3 = L3 and D4 = L0 would carry an average score of “2.25” — a politically comfortable result that achieves nothing in a crisis. A severed supply path remains severed, even if it is well documented.

Weighting would shift what cannot be shifted: sovereignty is multidimensional. The four domains measure orthogonal properties — they cannot be offset against one another. Sector-specific protection goals are therefore expressed via minimum levels per domain, not via weights.