Self-concept: This is our understanding and evaluation of who we are. It's like your personal biography that includes details about yourself such as your likes/dislikes, abilities/disabilities etc.
Group dynamics: These are the behavioral and psychological processes that occur within a social group (intergroup dynamics) or between social groups (intergroup dynamics). They're similar to the rules and strategies used during a board game; they guide how members interact with each other and with other groups.
Role theory: This suggests that human behavior is guided by expectations held both by the individual and by other people. It's like playing a character in a play; you act according to the role assigned to you.