Fitts's Law
Make actions effortless
Targets that are larger and closer are faster to hit.
Read more →
Jakob's Law
Use familiar patterns
Users expect your product to work like others they already know.
Read more →
Mental Model
Match user mental models
Align UI behavior with what people already believe about how the system works.
Read more →
Consistency
Be consistent
Same patterns, labels, and visuals reduce learning cost.
Read more →
Doherty Threshold
Keep the interface fast
Response under ~400 ms feels fluid; longer breaks flow.
Read more →