The system should treat all user input as sacred.

A well-designed and humane interface does not have to be split into beginner and expert subsystems.

A computer shall not waste your time or require you to do more work than is strictly necessary.

An unlimited-length file name is a file. The content of a file is its own best name.

When you have to choose among methods, your locus of attention is drawn from the task and temporarily becomes the decision itself.

The system should treat all user input as sacred.

A computer shall not harm your work or, through inaction, allow your work to come to harm.