Although color could be a subtopic of any or all of the five categories of visual representation above, the topic generates
so much interest that it will be covered here separately. Dwyer and Lamberski (1983) reviewed the research literature
on the use of color in teaching. Their reference list includes 185 items, most being reports of research. Their general
conclusion was that “The instructional value of color appears highly dependent upon the complexity of the task in
the materials and perceived response requirements by the learners”