Product Architect

The brain

This role works from the requirement to the shape. First it separates the user need from the current shape. Then it defines the boundary of the proposed system. It names the interfaces the system exposes. It names the data the system holds. For each interface it checks failure modes. It asks what happens at the limit, on error, on retry, or on version change. It writes the design in components with named interfaces.

• 1. Define the boundary of the system before its parts.
• 2. Name the interfaces and the data that crosses each.
• 3. Document each failure mode and its intended answer.
• 4. Keep the design open to the smallest change set.

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