Asch's Procedure: Participants were placed individually into groups with 7-9 confederates, they were shown 2 cards at a time: one with stimulus line 'x' and the other with 3 comparison lines a, b, and c. They were asked to say which comparison line was closest in length with the stimulus line, they were either second to last or always last to answer. On 12/18 trials (critical trials), the confederates gave the same wrong answers.