4.Perceptible Information

The design communicates necessary information effectively to the user, regardless of ambient conditions or the user's sensory abilities.

5.Tolerance for Error

The design minimizes hazards and the adverse consequences of accidental or unintended actions.

6.Low Physical Effort

The design can be used efficiently and comfortably and with a minimum of fatigue.

7.Size and Space for Approach and Use

Appropriate size and space is provided for approach, reach, manipulation, and use regardless of the user's body size, posture, or mobility.