UX Principles

🧠 Human Behavior & Mental Load

• Miller’s Law of Cognitive Load – Working memory holds ~7 (±2) items.
• Hick’s Law – Decision time increases with the number and complexity of choices.
• Serial Position Effect – Users best remember the first (primacy) and last (recency) items in a list.
• Fitts’s Law – The time to acquire a target is a function of distance and target size.

🖱️ Interaction & Usability

• Jakob Nielsen’s 10 Heuristics – Includes visibility of system status, match between system and real world, user control and freedom, consistency, error prevention, etc.
• Aesthetic-Usability Effect – Users perceive aesthetically pleasing designs as more usable—even if they’re not.
• Progressive Disclosure – Only show what’s needed, when it’s needed.

🎯 Attention & Visual Design

• Gestalt Principles – We group things by shape, proximity, etc.
• Peak-End Rule – People judge an experience by the peak moment and the end.

🧭 Structure & Flow

• Principle of Least Effort – People will always choose the easiest path.
• Three-Click Rule (guideline, not law) – Key actions should be quick to reach.
• Einstellung Effect – Users default to familiar patterns, even if better ones exist.
• Minimal Sharing – Don’t ask for more data than you need.

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