During middle childhood, a child's conception of the nature of friendship undergoes some profound changes. according to developmental psychologist william damon, a child's view of friendship passes through three distinct stages. the second stage is based on

I believe the answer is: psychological closeness

psychological closeness refers to the distinct similarities that we have with other people on the way we perceive the world.
William Damon believed that this similarities is a crucial factor that influenced whether you could build a friendship with another person