The interface should be a series of areas on the screen that are used consistently for different purposes
Users should always be aware of where they are in the system and what information is being displayed
Interfaces should be functional inviting users through careful use of white space, colours and fonts. There is often a trade off between including enough white space to make the interface look pleasing without losing so much space that important information does not fit on the screen
Although ease of use and ease of learning often lead to similar design decisions, there is sometimes a trade-off between the 2, novice users or infrequent users of software will prefer ease of learning, whereas frequent user will prefer ease of use.
Consistency in interface design enables users to predict what will happen before they perform a function. It is one of the most important elements in ease of learning, ease of use, aesthetics
MINIMAL USER EFFORT
The interface should be simple to use most designers plan on having no more than 3 mouse click from the starting menu until user perform work