This article illustrates how work contexts motivate employees to care about making a positive difference in other people's lives. I introduce a model of relational job design to describe how jobs spark the motivation to make a prosocial difference, and how this motivation affects employees' actions and identities. Whereas existing research focuses on individual differences and the task structures of jobs, I illuminate how the relational architecture of jobs shapes the motivation to make a prosocial difference.Why do I risk my life by running into a burning building, knowing that at any moment . . . the floor may give way, the roof may tumble on me, the fire may engulf me? . . . I'm here for my community, a community I grew up in, a community where I know lots of people, a community that knows me (firefighter; International Firefighters ' Day, 2004 Employees often care about making a positive difference in other people's lives. In the popular press, it is widely assumed that employees want to make a difference (Bornstein, 2004;Everett, 1995;May, 2003;Quinn, 2000). In order to motivate employees, many organizations define their missions in terms of making a difference (Collins & Porras, 1996;Margolis & Walsh, 2001Thompson & Bunderson, 2003). Qualitative research and quantitative research reveal that many employees describe the purpose of their work in terms of making a positive difference in others' lives (Colby, Sippola, & Phelps, 2001;Ruiz-Quintanilla & England, 1996), and research in diverse bodies of literature suggests that this motivation to make a prosocial difference is prevalent in a variety of work contexts. For example, in business, managers often attempt to improve the experiences of organizational members by persuading top administrators to address important issues (Dutton & Ashford, 1993;Meyerson & Scully, 1995) and by taking proactive steps to help proté gé s develop skills and advance their careers (Higgins & Kram, 2001). In public service, employees often place their own lives in jeopardy, beyond the call of duty, in order to protect the welfare of others: police officers chase armed suspects in order to safeguard their communities (Marx, 1980), and ambulance drivers speed through red lights at busy intersections in order to rescue victims (Regehr, Goldberg, & Hughes, 2002).Despite the evidence that employees are motivated to make a positive difference in other people's lives, the organizational literature is relatively silent about the sources of this motivation. Existing research suggests that dispositions may shape employees' motivations to make a prosocial difference. Employees who see their work as a calling want their efforts to make