This study is performed to trace personality change patterns of cadets in Korean Military Academy. To achieve this, we analyzed results of the Standardized Personality Diagnostic Inventory of 199 cadets at three times: before entrance(the first wave), beginning of junior cadet year(the second wave), before graduation(the third wave). The result shows that activity and dominance decreased steadily from the first wave to the third wave. Reflectiveness decreased at the second wave and then there was no change until the third wave. Change pattern in emotional stability was simliar to reflectiveness but the amount of decrease at the second wave was larger. There were similar reductions in sociability, autonomy and achievement at the second wave, but those traits showed small increases at the third wave, although the levels were still lower than the first wave measurement. In case of the clinical scales, neurosis scale was increased at the second wave and the level was maintained to the third wave. Psychosis and anti-social behaviors were increased at the second wave, but those measures decreased to the initial level by the third wave. Regarding gender difference, no mean difference was observed in activity, dominance, reflectiveness, sociability, autonomy, achievement scales, except for emotional stability. In addition, clinical scales showed some differential changes by sex. This study also discusses the significance and limitations of result.
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