The purpose of this experimental study was to investigate the comparative perceptibility of hypertext navigation buttons in three configurations: buttons with both pictorial symbols and text labels, with text labels only, and with pictorial symbols only. An instructional HyperCard stack was created in three versions, each differing only in the type of buttons used. Subjects were given typical situated tasks which required them to interpret navigational functions of various buttons. Findings indicated that buttons with both pictorial symbols and text labels resulted in significantly less user confusion than did buttons with pictorial symbols only. Buttons with text labels only also produced significantly less confusion, compared to those with pictorial symbols only. These findings have practical implications for hypertext designers. Many extant stacks typically use buttons with pictorial symbols only, which may create user confusion during stack navigation.

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