An experimental study examined the possibility that proximity error could bias results from semantic differential questionnaires. Proximity error occurs when, due to the ordering, or polarity, of the differential scales, one answer on the semantic differential results in another answer to a subsequent question being substantially changed from what it would otherwise be. A computer produced a set of semantic differential questionnaires which were controlled for various kinds of proximity error--effects due to order of concept presentation, of adjective presentation, and of order of adjectives within a particular scale. Three experiments were conducted varying questionnaires and types of proximity error. In each experiment all measures indicated no significant differences in response traceable to questionnaire format manipulations, showing that proximity error was not a problem in administering semantic differential questionnaires. (BB)