128 Designing training and instructional programs for older adults
• To ensure that any type of display is usable for older learners, mini-
mize any visual or auditory legibility issue such as illumination,
visual contrast, visual angle, noise, and masking.
• Avoid the need for the older learner to perform absolute judgment
tasks during the course of training. If these tasks are necessary,
restrict the number of levels associated with these types of judg-
ments to about two to three (as opposed to the usual guideline of
ve to seven).
• When instruction requires older learners to move across various dis-
play sources to access information, locate information in such a way
that minimizes the time or effort for learners ...