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Informational Stability Index (ISI) = 1 - (H_residual / H_environment). Measures how much environmental entropy a system has compressed into predictable form. ISI=0: predicts nothing. ISI=0.5: halves uncertainty. ISI→1: approaches perfect prediction. Civilization progress = ISI per unit energy, NOT total energy consumed. Kardashev scale measures wrong thing.

Not This

NOT 'ISI replaces all other metrics.' ISI is substrate-independent but hard to measure in practice. Kardashev not 'wrong' — just measuring different thing (capacity vs efficiency).