# Critical path
From [[raoGUTSGrandUnified2018]]:
* Generalized critical paths are *zones where there is a tight dependence of ends on means*
* Critical paths require two conditions
1. You’re optimizing a system for a *single goal*
2. You have a global model for how to achieve that goal
The “optimizing” part is important because it creates a tight coupling between critical paths and [[Efficiency]]
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