Consistency
Consistent with real life: in line with the process and logic of real
life, and comply with languages and habits that the users are used to;
Consistent within interface: all elements should be consistent, such
as: design style, icons and texts, position of elements, etc.
Operation feedback: enable the users to clearly perceive their
operations by style updates and interactive effects;
Visual feedback: reflect current state by updating or rearranging
elements of the page.
Simplify the process: keep operating process simple and intuitive;
Definite and clear: enunciate your intentions clearly so that the
users can quickly understand and make decisions;
Easy to identify: the interface should be straightforward, which helps
the users to identify and frees them from memorizing and recalling.
Decision making: giving advices about operations is acceptable, but do
not make decisions for the users;
Controlled consequences: users should be granted the freedom to
operate, including canceling, aborting or terminating current
operation.