This paper is focused on a lukewarm(nurumayu in Japanese)constitution of Japanese firms, which is a typical state of the low-vitality organization in Japan. This study proposes an effective temperature hypothesis, which explains that the member's sense of lukewarm is caused by the difference between the system temperature and the body temperature. The system temperature and the body temperature are defined as the indexes of change inclination of the organizational system and the members, respectively. We develope a method to measure the body temperature and the system temperature, and by using this method, the effective temperature hypothesis is supported by our empirical research on Japanese firms. This hypothe sis provides a useful method to examine the degree of vitality of the organization.
