Hardware checklist

Checkpoint 2.2: Tactilely discernable keys

Provide keys which are tactilely discernible without activating them.


Rationale

A user who is blind or visually impaired will have difficulty distinguishing flat membrane keys or buttons unless there is a tactile distinction between the keys. Users need to be able to identify the keys without activating them.


Required development techniques

Use one or more of the following techniques to meet Checkpoint 2.2 from the IBM Hardware Accessibility Checklist


Required test techniques

Test the hardware to ensure that it complies with accessibility requirements.

Tools

You will need the following tools to test this checkpoint:

Techniques


One or more of the following techniques are required to verify this checkpoint:
Action Result

1

Use a QWERTY or ABC keyboard. This can be accomplished by touching or viewing the keyboard.

Pass:

Fail:

2

Use a standard 12-key telephone or a standard 17-key numeric keypad.

Pass:

Fail:

3

If the home keys have tactile labels (nibs), use either a feeler gauge or calipers to check the height of the nibs (e.g., F and J on a QWERTY keyboard, or the 5 key on the numeric keypad.) If there are no tactile labels (nibs) on the home keys, use a ruler to measure the concave depth of the home keys.

Pass:

Fail:

4

Check that spacing or shape can be used to distinguish keys. Check that keys have ridges around them. Check to see if some keys are convex. Check to see that some keys have a bump or depression on the key.

Pass:

Fail:

©2009 IBM Corporation

Last updated July 01, 2009.