Probably the single most important factor in making a system simple to use is consistency because it enables users to predict what will happen; once they can interact with one part of the system, they will know how to interact with the rest.

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Consistency allows users to develop mental models of how the system works, making it easier for them to use and predict how the system will behave. This makes the system more intuitive and less frustrating for users.

Probably the Single Most Important Factor in Making a System