To examine the effect of various activities and interactions on the attitudes of members of co-cultures toward each other was the purpose of this study. The research was conducted in two stages. In the first stage, semantic differential scales were developed for the measurement of attitudes toward co-cultures. Each of five sets of scales was used to measure perceptions of a different cultural group: black, Chicano, native American, Anglo, and Filipino. The data were collected from 89 students enrolled in basic speech communication courses at the University of New Mexico. The students were randomly selected and instructed to indicate their feelings about each cultural group as accurately as they could for each scale. The findings indicated that similar factor structures were found when measuring the perceptions of co-cultures together or separately. In the second stage, attitudinal changes across activities and cultures were measured. A group of six Anglo and six Chicano subjects engaged in a series of four co-cultural activities, and subjects also responded individually to attitude scales. The findings indicated that there is no difference in the effects of certain co-cultural information activities on attitude changes toward other cultures. (WR)