Eleven female students, in a graduate education course entitled "Mental Health and Human Interaction," participated in a single 24-hour sensitivity training group and were studied to identify personality changes resulting from the session. During the marathon session, an aura of warmth, acceptance, and security was maintained, creating an open atmosphere in which the leader emphasized support and encouraged individuality. Each member was administered the California Psychological Inventory (CPI) and the Rotter Incomplete Sentences Blank (RISB) before and after the session. Participants were also interviewed within 1 week after the session. One month after the session, when participants again completed the CPI, 8 of its 18 subscales showed significant improvement: (1) socialization; (2) social presence; (3) tolerance; (4) sociability; (5) social acceptance; (6) state of well being; (7) responsibility; and (8) self control. Significant improvement was noted on the RISB scores for conflict and self-esteem. Study results indicate that sensitivity training may be beneficial in teacher training since it can provide a supportive atmosphere for self-disclosure and getting in touch with feelings, allowing teachers to become more aware of students' needs. (FG)