A group’s performance on almost any type of task depends not only on the knowledge, skills, and abilities of it members, but also on their motivation. Insufficient motivation can spell disaster for a group, no matter what level of skill or ability its members may possess. In this chapter, I address the question of whether people’s task motivation might be enhanced when they work collectively in groups as opposed to when they work alone, and, if so, under what conditions their enhanced motivation translates into measurable group-level performance gains.