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A high-quality friendship is characterized by high levels of prosocial behavior, intimacy, and other positive features, and low levels of conflicts, rivalry, and other negative features. Friendship quality has been assumed to have direct effects on many aspects of children's social development, including their self-esteem and social adjustment. Recent research suggests, however, that friendship quality affects primarily children's success in the social world of peers. Friendship quality could also have indirect effects, by magnifying or diminishing the influence of friends on each other's attitudes and behaviors. Having high-quality friendships may lessen children's tendencies to imitate the behavior of shy and withdrawn friends, but little evidence supports the hypothesis that high-quality friendships magnify friends’ influence.
Thomas J. Berndt (2002) studied this question.