10. universal design

EXERCISE 10.10 [extra - not in book]

Why did the widespread introduction of GUIs reduce the accessibility of computer systems to visually impaired people?

answer available for tutors only

Prior to the introduction of GUIs visually impaired users had access to command based textual interfaces through the use of screen readers and Braille input/output devices. Most visually impaired users can touch type so keyboard input not a problem. When GUIs were introduced navigation around the interface became impossible as user could not see the icons/menus and screen readers cannot read a graphical screen. In addition users with problems with hand-eye co-ordination may find using pointing devices more difficult to use than text based interfaces (particularly aided by a reactive keyboard). Increasing use of multimedia and audio channels has implications for deaf users.

Other exercises in this chapter

ex.10.1 (tut), ex.10.2 (tut), ex.10.3 (tut), ex.10.4 (tut), ex.10.5 (tut), ex.10.6 (tut), ex.10.7 (tut), ex.10.8 (ans), ex.10.9 (tut), ex.10.10 (tut)

all exercises for this chapter