The Median Group. Training and Supervision - The author summarize the main theoretical concepts concerning group analysis. Withregard to the median group an experience of training and supervision is reported. The traineesparticipated for three years as group members in a median analytical group. Further theyparticipated as cotherapists in a Median Group for two years performing weekly groupanalyticalsupervision. The author take into consideration mirroring as a basic phenomenonin the supervision process in a Median Group. Two very meaningful sessions of the supervisiongroup are reported.Key words: Median Group, training, supervision.