An experimental study was carried out at the Malmö School of Education in 1969 and 1970 for the purpose of studying the effects on the self-assessment of student teachers of, firstly, externally mediated self-confrontation processes (via closed-circuit television and video-recording), and secondly, dyadic confrontation processes (in the form of traditional tuto¬ring). Detailed reports on the background, design and result of the experiment have been presented in Swedish. The present report gives a brief description of the design, the results, and some implications of the separate analyses. On the basis of the experimental results, general recommendations are given for continued research on closed circuit television techniques. Finally, an outline is given of some important tasks for analysis, for which data have already been collected. (Extended with test data).