Block 1 · Foundation

The Interface

Where a person meets the system.

Tier 1 · Concept

Every product has a place where a human being touches it. A menu on a wall, a screen in a hand, a form on a desk. Nothing else in the system exists to the user until this surface shows it.

Key takeaways

It only shows — it doesn't remember or decide.
Every industry has one, whether it's a screen, a counter, or a paper form.
If the interface is confusing, the whole system feels broken even when the back is fine.

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