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A study was conducted to compare the relative comprehensibility ofpictorial information and printed words in instructions. Six picture-word formats were examined using 24 procedural problems on three types oftasks. The formats were print-only, pictorial-only, pictorial-related print, print-related pictorial, pictorial-redundant print, and print-redundant pictorial. The results showed pictorial information important for speed but print information necessary for accuracy. Comprehension of instructions on all three tasks was most efficient with the pictorial-related print and pictorial-redundant print formats but could not be shown to be simply a function ofnumber ofvisual information channels used or the degreeofredundancy between channels. The type of information displayed ;n the visual channels was found to be important.

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