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EFFECTS OF ATTITUDE SIMILARITY AND TOPIC IMPORTANCE ON INTERPERSONAL ATTRACTION WITH RELATION TO THE DIMENSIONS - OF ATTRACTION- TATSUO FUJIMORI Waseda University ABSTRACT This study was designed to investigate the dimensions of attraction and the effect of attitude similarity and topic importance on each of main dimensions of attraction. In the first experiment, there were three test sessions at the intervals of 5-7 days. At the first session, on the basis of a prelimiary survey, chosen as the attitude scales and rated on a 6 point scale by 70 subjects. At the second session, the half of the subjects were given the questionnaire as of 5 strangers who had responded to the same 8 most important topics and then asked to evaluate each of 5 strangers on 26 attraction rating scales. The responses of 5 strangers were similar to those of the subjects on 5 levels (0%, 25%, 50%, 75% and 100% similarity). The similarity was defined as the amount of proportion of similar responses between the subject and the stranger on 8 items. A dissimilar response was 3 points of discrepancy from that of the subject, whereas a similar response was always the same. At the third session, they were given the ques- to evaluate each stranger. The rest of the subjects were given, at the second session, the ques- In the second experiment, there were also three test sessions at the intervals of 5-7 days. The method was much the same as that of the first experiment, but the following two points were different. (1) The subjects (30) were given the responses of 3 stragers (0%, 50% and 100% similarity). (2) A dissimilar response was 1 point of discrepancy. The main results were as follows. 1. The correlation matrix of the attraction rating scales was factorized by Principal component analysis and the four factors with the large eigenvalues were rotated by Varimax method. These four factors accounting for 67.6% of the total variance were Intimacy, Companionship, Recognition and Cooperation. 2. In both experiments, the attitude similarity-attraction theory proposed by Byrne, D. was completely confirmed. That is, the effect of attitude similarity was found to be highly significant on each of four dimensions of attraction. The effect of topic importance, however, was not significant.