The document reviews literature relevant to studying the social identities of volunteers and those they assist and the relationship between these groups. It discusses how social identity theory and social categorization theory can provide insight into how individuals view themselves and others. The literature suggests group membership shapes self-concept and stereotypes which impact intergroup relations. Prior research informs that social identities influence daily interactions both between and within groups. The review establishes a foundation for further studying the specific relationship between volunteers and those they assist to better understand its dynamics and potential for improvement.