The present research investigated the efficacy of sensitivity training in developing attitudes and skills which can further effective communication on the college campus. Two sensitivity training laboratories were conducted a year apart for Baylor University students. A pretestposttest quasi-experimental design was used in which the posttest was administered either immediately following or approximately three months after the laboratory. Changes attributable to the laboratories were measured by objective personality and attitude tests and sentence completion tests. It was concluded that sensitivity training was instrumental in producing attitudinal and personality changes in the participants. These changes appeared to be relatively enduring and in some cases were greater three months after the laboratory than immediately afterwards. Students who attended the laboratory returned to the campus with attitudes and personality responses that were similar to those of college seniors. The participants increased in their tolerance of others, acceptance of others, and capacity for mature criticism of institutionalized authority.