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.