A first attempt to investigate effects of viewing videotapes of one's teaching behavior is reported. Thirty-eight teaching interns at a California State College viewed videotapes of their practice teaching without the presence of a supervisor or guidelines. No control group was used. Pre- and post-viewing questionnaires and interviews were administered to assess self-attitudes and attitudes toward teaching performance. The results indicated that in the absence of standards or models, satisfaction with one's teaching performance was determined by initial self-attitudes. When low satisfaction with general performance was reported in the first interview, defensive reactions to self-viewing appeared to predominate with slight improvements in attitude occurring and few specific teaching cues recalled in the second interview. The findings are taken to suggest a differential use of self-viewing procedures in professional training with presentation methods determined by personality variables of the viewer. (SS)