11.3.2.3.1-1 Appropriate Pointer or Controller Input Device for the Task

The type of pointer or controller input device should be appropriate for the tasks anticipated for its use.

Additional Information: Table 11-6 identifies the appropriate use of various control and input devices. ISO Standard 9241-9, “Requirements for Non-keyboard Input Devices,” provides guidance on how to measure the effectiveness and usability of nonkeyboard computer input devices.5908

 

Table 11.6 Control And Input Devices For Human-Computer Interaction

 

 

Device

Conditions for Appropriate Use

Cursor Control Keys

Cursor moves in X and Y dimensions.

Touch Screen

Moving/holding arm to screen for long periods of time is not required. Screen does not have small poke points relative to size of fingertip.

A low level of resolution is required for positioning.

Task will not be disrupted by hand temporarily blocking screen.

Light Pen

High positioning precision is not required.

Holding arm to screen for long periods of time is not required.

Mouse

Adequate space is available for mouse movement over a pad or desktop. A low-to-medium level of resolution is required for positioning.

Periodic cleaning is provided.

Isotonic Joystick (Displacement)

Positioning accuracy is more important that positioning speed.

Trackball

Rapid cursor positioning is desirable.

Limited space is available for installing an input device.

Graphics Tablet

A low-to-medium level of resolution is required.

Isometric Joystick (Force)

Precise or continuous control of two or more related dimensions is required.