Understanding the Two Volumes

Readers may notice that some concepts appear throughout both volumes.

This is intentional.

Trustworthy intelligent systems cannot be separated into independent engineering disciplines. Engineering, operations, governance, and stewardship are interconnected responsibilities that continuously reinforce one another.

Volume I primarily teaches how systems are engineered.

Volume II primarily teaches how systems are sustained.

Certain concepts, however, span the entire lifecycle, including:

• Repository-centered engineering
• Evidence-centered engineering
• Human oversight
• AI governance
• Engineering transparency
• Continuous accountability

Readers should not think of the volumes as separate destinations.

Instead, think of them as two phases of a single engineering journey.

Throughout ETIS, one principle remains constant:

Trust is not a deliverable. Trust is continuously engineered.