An advantage of computer graphics is that they can be drawn either statically or dynamically. Moreover, they can
be called or dismissed interactively. Alesandrini (1987) reviewed the research relevant to computer graphics in learning
and instruction. She introduced her chapter with the following caveat:
The effects of computer graphics on learning and motivation are only beginning to be explored. While many
studies have investigated the use of graphics in traditional instruction, few studies have investigated graphics in CAI
(computer-assisted instruction) or the instructional uses of graphics application software. Although the published findings are limited, many projects are currently underway to field-test the variety of uses of computer graphics (p. 159).