CONCEPT
The Gulf of Evaluation
The distance between what a system has done and what the person can perceive, interpret, and judge about what it did — the gulf that has blown open in the AI era precisely because the Gulf of Execution collapsed.
Norman's second foundational chasm separates the system's state from the person's understanding of that state. In the pre-AI era, the Gulf of Evaluation was primarily a perception problem: the system had done something, and the design either did or did not make that something visible and interpretable. Well-designed feedback closed the gulf; poorly designed feedback left the user guessing. The AI era has transformed the Gulf of Evaluation from a perception problem into a judgment problem. The person can see the output — the code, the prose, the design — but cannot understand it well enough to evaluate whether it does what she intended, handles edge cases, or contains subtle errors that will surface only under conditions she has not yet imagined.
In The You On AI Field Guide
The transformation of the Gulf of Evaluation is the central structural diagnosis of the Norman volume. Under the classical model, the person