UID from the perspective of Cognitive Psychology makes information conveyed between human and machines more complete and smoother. By studying the user's cognitive habits, such as language representations easier to understand, forms easier to memorize, and operations easier to learn, so as to reduce the usage of cognitive resources. As far as the human brain, the less cognitive resources are used, the less cognitive conflicts there will be, so is the sense of frustration.

• Interface Interaction: how to convey messages to users, how users express needs, what is users’ goal.

• UID requires comprehensive application of multiple disciplines and knowledge of users’ physical and mental characteristics, cognitive development and actual needs, and apply them to the functions and forms of products.

• Cognitive Psychology offers Interface Interaction fundamental design principles.

• Cognitive Psychology lays scientific foundations for Interface Interaction in studying users’ personality and behavior, and user modelling.

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