Controls and latches should be reachable and operable with one hand and minimal dexterity.
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Users with little or no use of their hands or with limited reach can have difficulty accessing and manipulating some controls. System controls which are located at the rear of the system cannot be operated by a user in a wheel chair or with limited reach. A user with limited dexterity cannot use latches or controls which require a tight grasping or twisting motion to activate them. A user with one hand cannot open laptop computers which require two latches to be released simultaneously.
Required development techniques
The following techniques are the minimum required to meet Checkpoint 1.1 from the IBM Hardware Accessibility Checklist:
Recommended development techniques
The above techniques are required; the following techniques are recommended to enhance accessibility.
Required test techniques
|1||Check that each control can be activated with only one hand, requires no
tight grasping, pinching, no twisting of the wrist, and requires no more
than 5lbs of force to activate.
Use a force or torque gauge to measure the force required to activate the control.
|2||The position of any operable control shall be determined with respect to a vertical plane, which
is 48 inches in length, centered on the operable control, and at the maximum protrusion of the product
within the 48 inch length.
Use a tape measure to determine the vertical plane location.
Measure 24 inches on each side of the control. Move from the control toward the front of the product until the 48 inch plane can be placed directly adjacent to the front.
Measure the distance from each control to the vertical plane.
Measure the distance from each control to the floor.
©2009 IBM Corporation
Last updated July 01, 2009.