Work teams have become increasingly prevalent around the world in the past two decades. Underlying their popularity is the belief that they can creatively integrate individual members’ talents and skills to more effectively respond to the changing and competitive business environment. However, not all teams are functional and individual members may not automatically work together smoothly. A question that naturally follows is: Why do some teams succeed while others fail? We contend that collective motivation is critical to the success of a work team. Our research confirms this idea by demonstrating the positive role that a special form of team motivation — pro-social motivation — has on team effectiveness.