Design Principles

1. Use cases, goals and preferences of users should be clearly known.
2. UI should be self-explanatory. There shouldn’t be any need of extensive documentation for users
3. UI should be task centric, not feature centric
4. The user interface is said to be well designed only when the program model conforms to the user model
5. UI design should be consistent. UI designers shouldn’t use their creativity to make an UI which works in totally different way than other programs intended for same purpose.