CONCEPT
Instrumental Rationality
Max Weber's name for reasoning that evaluates means against given ends without questioning the ends — the dominant mode of modernity and, in Buber's diagnosis, the institutional form of I-It that produces the eclipse of genuine encounter.
Max Weber's Zweckrationalität — typically translated as 'instrumental rationality' or 'means-ends rationality' — names the mode of reasoning that evaluates means against predetermined ends without subjecting the ends themselves to rational scrutiny. Modern bureaucracy, scientific method, market calculation, and engineering practice all operate in this register. The mode is enormously productive within its scope; it has produced the extraordinary material achievements of modernity. But when it becomes the only legitimate form of reasoning — when the question 'is this worth doing?' is replaced by 'can this be done efficiently?' — it produces what Weber called the iron cage and what Buber called the eclipse of God. The AI moment is the culmination of instrumental rationality applied to thought itself — which is why its philosophical significance extends far beyond its technical capabilities.
In The You On AI Field Guide
Weber's four-fold typology of social action distinguished zweckrational (instrumental-rational), wertrational (value-rational), affective, and traditional. Only the first