Page 219 - Handbook of Electronic Assistive Technology

Chapter 7 • Alternative and Augmentative Communication 207

Options Considered
Martin was using X–Y scanning on his iPad prior to the assessment, which allows you to
use a single switch to select a point using a scanning vertical bar and horizontal scan-
ning bar to select an X–Y coordinate on the screen. Once you select the coordinate, the
cell (letter) will activate (Fig. 7-5). Martin had set up a spec switch on a book to access his
iPad himself (Fig. 7-6). Alternatives to his switch set-up were explored using switches that
required little pressure to ensure consistent access with the least effort, and he was able to
use the switch throughout the day without fatigue (Fig. 7-7).

FIGURE 7-5 XY scanning�

FIGURE 7-6 Switch set-up prior to the assessment using a spec switch�