Visibility. It should be obvious what to do by looking at the device. • Feedback. All responses should receive immediate and continuous feedback. • Conceptual model. The visitor conceptual model of how something works must match the designer’s model.
Visibility. It should be obvious what to do by looking at the device.• Feedback. All responses should receive immediate and continuous feedback.• Conceptual model. The visitor conceptual model of how something works must match the designer’smodel.