How do friendships change over the course of the middle childhood years?

What will be an ideal response?

A good answer would include the following key points:
- Children's understanding of friendship passes through stages:
- Basing friendships on others' behaviors
- Basing friendships on trust
- Basing friendships on psychological closeness
- Popularity in children is related to traits that underlie social competence.
- Friendships are important, and to improve social interactions, children should learn social problem-solving skills and skills involved in processing social information.