The Matrix: four pillars by five scales, twenty cells.
The Index reads twenty parts of city life: four pillars across five scales, from a neighbourhood to a whole bioregion — the natural region a city sits in. Each cell carries a documented PITO weight (products in, trash out — buy far, waste near) and a documented DIDO weight (data in, data out — sense, share, make locally), summing to 1. Click any cell for what it measures, where each pilot's data comes from, and whether that data is real yet. The single cell Utopies (2018) and Boeing (2024) measured — the Generation 1+2 territory — is outlined in iron.
On the Generation 1+2 cell. The Economic × City / Region cell is what Florentin, Chabanel & Guimas measured for ~600 French urban areas (Paris 37.58) and what Boeing measured for Hamburg (37.00). The convergence between two independent statistical systems six years apart, on this same cell, is the public-data ceiling — a property of global supply-chain geometry, not of either city. The remaining 19 cells of the matrix are the surface area FCI 3.0 adds to that result.
On the v0 weight table. The PITO/DIDO weights shown in each cell are documented in Methodology §3. Three cells in particular — Economic × Bioregion (0.8 / 0.2), Environmental × Community (0.5 / 0.5), Economic × Community (0.3 / 0.7) — deserve sharpened argument before the weights harden. All three are in methodological review toward v1.