Washing machine:
What is wrong?
Bad communication between user and system.
Bad communication between user and system.
Gulf of Execution:
How do I know what I can do?
What actions are allowed by the system?
How do I do it?
Gulf of Evaluation:
How do I know what happened?
What does it mean?
Have I accomplished my goal?
The position of the controls on the keyboard is not logical; the hand have to move from one extreme to another of the surface. Changing the cycle the washing machine automatically resets the spin.
Examples of control panel that work better