hci

name	hci
description	Human-computer interaction design principles
license	MIT
metadata	{"audience":"developers","category":"design"}

What I do

• Design intuitive human-computer interfaces
• Apply cognitive load theory
• Implement gesture and voice interactions
• Create natural user interfaces
• Evaluate interaction paradigms
• Optimize user task efficiency

When to use me

When designing interactive systems, selecting interaction modalities, or optimizing user efficiency.

Key Concepts

Interaction Paradigms

CLI: Command-line interfaces
GUI: Graphical user interfaces
WIMP: Windows, Icons, Menus, Pointers
NUI: Natural User Interfaces
TUI: Tangible User Interfaces

Fitts's Law

Time = a + b * log2(D/W + 1)
D = distance to target
W = width of target

• Larger targets are faster to click
• Edges and corners are optimal positions
• Context menus reduce travel distance

Hick's Law

RT = a + b * log2(n + 1)
n = number of choices

• Minimize options for speed
• Use progressive disclosure
• Chunk information

Design Principles

1. Visibility of system status
2. Real-world mapping
3. User control
4. Error prevention and recovery
5. Consistency
6. Flexibility
7. Aesthetic design
8. Help and documentation

Cognitive Models

• GOMS (Goals, Operators, Methods, Selection)
• Keystroke-Level Model (KLM)
• Cognitive Walkthrough
• Think-aloud protocol

Input Modalities

• Mouse/keyboard
• Touch gestures
• Voice commands
• Eye tracking
• Brain-computer interfaces
• Motion sensors