Visibility - user can tell what state the device is in and the alternatives for action
A good conceptual model - designer provides a good conceptual model for the user with consistency in presentation of operations and results and a coherent, consistent system image
Good mappings - it's possible to determine the relationships between actions and results, between the controls and their effects, and between the system state and what is visible
Feedback - use receives full and continuous feedback about the result of actions
From The Design of Everyday Things by Donald Norman.
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