# Interacts with Humans Directly **Trait Number:** 13 **Layer:** Functional **Bit Position:** 5 (bit 13 overall) **Binary Encoding:** `00000000 00001000 00000000 00000000` **UHT Code (self-encoding):** `00 08 00 00` --- # Icon ![[Icon13.png|200]] ## Definition The entity is designed or expected to **interface directly with a human**, whether through input, output, presence, or other interaction. --- ## When to Apply Use this trait when the entity: - Is **operated by or responds directly to a person** - **Presents affordances** (e.g., buttons, screens, handles) - Provides **feedback, control, or visibility** to users Avoid applying if the entity: - Is **buried in the system** and never seen or touched by a human - Only interacts with other systems or software - Has **no intentional or interpretable interface** --- ## Related Traits - [[Perceptible]] — Perceptibility is often a prerequisite, but not sufficient for human interaction. - [[Symbolic / Representational]] — Many human interfaces are symbolic. - [[Teachable / Transmissible]] — Systems that interact with people may also support knowledge exchange. --- ## Examples - A touchscreen or knob - A chatbot interface - A fire alarm button - A dashboard gauge - A voting ballot - A classroom whiteboard --- ## Commentary This trait identifies **direct coupling between system and user**. It’s important in UX design, safety systems, industrial controls, and human-machine teaming. Be careful to distinguish between **intended human-facing systems** and incidental visibility. A system part may be seen, but not _interacted with_ directly. --- **© 2025 Steven Holland. All rights reserved.** [[Copyright Statement]]