The ability to allocate attentional resources to relevant aspects of a stimulus event is a critical skill needed for efficient information processing. Evidence suggests that this ability to focus on relevant information without interference is dependent on the nature of the stimulus structure of the information to be processed. To test the hypothesis that stimulus structure plays an important role in the processing of multidimensional objects, a speeded classification task designed to measure successful focused attention was employed in a study involving 45 college students. Subjects were asked to sort objects on the basis of their dimensional values. Three dimensional sets were used: fused integral (hue/brightness), analyzable integral (integral color/form), and a newly developed set of objects composed of separable dimensions (separable color/form). The results obtained with fused integral dimensions indicated that processing the objects into their component parts was difficult, resulting in interference. Results obtained with integral analyzable stimuli revealed that subjects were able to process these objects into component parts. Results obtained with the new analyzable stimulus set revealed that subjects experienced no redundancy gains and no interference. Taken collectively, these results suggest that researchers should consider stimulus structure when examining variables which affect the processing of multidimensional objects. (NB)