The system should treat all user input as sacred.
More Quotes from Jef Raskin:
As far as the customer is concerned, the interface is the product.Jef Raskin
Users do not care about what is inside the box, as long as the box does what they need done.
Jef Raskin
A computer shall not waste your time or require you to do more work than is strictly necessary.
Jef Raskin
An interface is humane if it is responsive to human needs and considerate of human frailties.
Jef Raskin
A computer shall not harm your work or, through inaction, allow your work to come to harm.
Jef Raskin
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