Necessary
modifications were done by considering the expert ideas. Another
group of subjects tested the understandability of the developed
icons by matching method, and final icons were proposed. They
easily identified the corresponding meanings for the great
majority of the proposed icons. The user interfaces layout was
then examined and evaluated by the target users. Interfaces were
developed as the final design prototype. We found that the
participatory icon design process is successful in reducing system
complexity and increase usability. We also found that the
participatory design process is useful with the elderly. The older
adults reported the participatory design process is interesting
and believed the resulting designs would be more familiar and
friendlier.