In training facilitators for laboratory groups, also known as T-groups or encounter groups, the majority of group facilitators and therapists advocate an experiential apprenticeship in an ongoing group. However, the actions of an inexperienced facilitator trainee may have a negative effect upon the members of the group. The author experimented with training a person in group facilitation skills, by using him as a videotape camera operator whose task was to record his perceptions of a group in such a manner that the tape could be used to make an appropriate, though delayed, intervention. The trainee, "Jim," filmed each group meeting in a college-level laboratory class in interpersonal communication and then conferred with the supervising facilitator to compare perceptions of the meeting. Later, the tapes were screened and discussed in terms of Jim's insights and his techniques for illustrating them. The group saw five videotaped segments of their interactions during the semester. A comparison of tapes made during Jim's training period revealed his growing sensitivity to the group process and to the emotional states of the participants. These benefits to the trainee were obtained without hazard to the class members, who in fact benefited from the feedback provided by the tapes. (GW)