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The authors studied the use of an evolving interface style book to evaluate the role of such guidelines in the development of style-conforming interface designs. Although the designs were judged to be generally conforming, study participants had significant difficulty in interpreting the guidelines. Our designers were manifestly task oriented and impatient with extrancous material. They depended heavily on the pictorial examples, often to the exclusion of the accompanying text. The authors conclude that dependency on guidelines should be minimized, and that guidelines should be developed primarily to complement toolkits and interactive examples, focussing on information intrinsically unavailable through those vehicles.