In this experiment two variables relevant to explaining the social support phenomenon were investigated. Response position of the partner (first vs fourth) and contact between partner and S prior to the group situation (contact vs. no contact) were manipulated. Male and female Ss responded to visual, information, and opinion items in a group pressure situation. Results indicated that while social support in both the first and fourth positions significantly reduced conformity compared to a unanimous condition, support in Position 1 was significantly more effective than in Position 4. In addition, contact with the supporter increased conformity in the unanimous condition, but decreased conformity in both social support conditions. Possible mechanisms underlying the position and contact effects were discussed. (Author)