This paper discusses the effects on college students of a weekly personal growth group and a marathon growth group, both of which are forms of experiential learning focusing on expanded awareness of self and environment, authenticity, and more effective interpersonal communication. The experiential-Gestalt growth group is a relatively unstructured group experience which emphasizes the exploration and expression of here-and-now feelings concerning self and other group members. Focus is put on what "is," on awareness of one's experiencing and interpersonal interactions, and on awareness of ways in which one prevents himself from feeling, moving, and living more fully and honestly. Marathon growth groups, a time extended growth group experience, are a group practicum in intimate, authentic, human interaction to facilitate a transition from self defensive alienation to transparency and psychological intimacy through genuine encounter. The studies support the proposition that the experiential-Gestalt growth group may be an effective method for fostering the process of personal growth and experiential learning in relatively healthy, growth seeking individuals. The growth center model is currently being implemented at Bowling Green State University. (Author/TA)