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Model, component, workflow, trajectory, and system

The right boundary contains the mechanism you want to attribute: a trajectory is evidence of one execution, while the outcome confirms whether the change matters to the system.

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Video summary

The ideas to retain

01

Start by defining the object, not the metric

A useful abstraction for an AI system is:

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Level 1 — Evaluate the model

A model eval tries to measure model behavior under a controlled harness.

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What a model eval can support

It can support a statement such as:

Key moments

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  1. Start from the change and choose the smallest boundary
  2. A trajectory connects policy, components, and outcome
  3. Diagnose narrowly; confirm at the risk boundary