These principles are grounded in established research:
| Law | Summary | Where Applied |
|---|---|---|
| Hick's Law | Decision time increases logarithmically with the number of choices | Progressive Reduction |
| Miller's Law | Working memory holds ~7±2 items; 5 is safer for decisions | Structured Optionality sub-rule |
| Postel's Law | Be liberal in what you accept, conservative in what you output | Preserved Agency |
| Aesthetic-Usability Effect | Beautiful interfaces are perceived as more usable | Earned Aesthetic |
| Doherty Threshold | Response under 400ms maintains cognitive flow | Implementation guidance (not a principle) |