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A Uniform Code for Human-Centered Digital Systems

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This book establishes a doctrine of Human-Centered Systems Engineering for the design, governance, and evolution of digital systems.

Its purpose is to codify enforceable standards that can be applied, tested, and upheld across teams and systems (not to describe and explain best practices—at least for now).

It serves three functions:

1. Defines non-negotiable, human-centered principles that must guide digital system behavior.
2. Provides operational directives for translating those principles into product requirements and engineering decisions.
3. Creates a shared organizational framework for evaluating, auditing, and evolving UX and AI-mediated systems.

1. Human Cognition & Behavior

▶ How humans perceive, think, remember, and decide during interaction with the system. ▶ These govern whether the interface can be understood at all.

Mission statement

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Ensure systems respect the limits and strengths of human perception, attention, memory, and decision-making so interfaces can be understood and used with confidence.

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2. Information Architecture & Wayfinding

▶ How users locate information, orient themselves, and move through the system. ▶ These govern how users navigate, explore, and progress through the system.

Mission statement

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Help users locate information, orient themselves, and move through systems without confusion, disorientation, or unnecessary effort.

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