= Jakob nielsen =

His heuristics

* visibility of system status
* matche between system and real world
* user control and freedom
* consistency and standards
* error prevention
* recognition rather than recall
* flexibility and efficiency of use
* aesthetic and minimalist design
* help users recognize diagnose and recover from errors
* help and documentation

== Score system ==

0) No problem
1) Cosmetic
2) minro usability
3) major usability
4) catastrophic usability issue