For example, what makes people define themselves in terms of one group membership rather than another?

There are three political levels to be considered: individual leaders, group leadership and full group membership.

However, it is believed that group membership will become more central in a natural manner as the close relationship develops.

Social capital: resources based on group membership, relationships, networks of influence and support.

And the best way to do that is to put the individual's abilities, not group membership, at the center of our attention.

A major reason is that group membership often results in some form of need satisfaction on the part of the individual.

The group membership was international, people came from all over the world to join in and make a difference.

In this case it refers to a positive or negative evaluation of another person based on their group membership.

The music style has changed with group membership and their sound became more consistent.

If your school or club does not have group membership already, why not suggest they join?