This monograph is a lucid presentation of a series of four experiments with children seven to thirteen years of age, designed to study the effect of group opinion on the opinion of a small minority or an individual. Using a relatively simple perceptual task of comparing, matching or estimating lengths of lines, the majority group was coached beforehand to give incorrect answers on selected items. The experimental situation consisted of studying the behavior of naïve subjects when confronted with dissenting group opinion. The findings showed that the amount of 'following' varied principally with the age of the subjects (younger children 'follow' more