This article reviews research on motivation of employees in theT HIS ARTICLE EXPLORES the necessity of nonprofit specifications in the existing motivation theories. Most motivation-related nonprofit research concentrates on existing and well-documented motivation theories stemming from the for-profit sector. Three basic themes have received most attention in this respect: the two-factor theory by Herzberg, Mausner, and Snyderman (1957), the job characteristics model by Hackman and Oldham (1980), and the expectancy-valence motivation theory by Vroom (1964). These theories, which represent either a content approach or a process approach to motivation, dominate the research agenda. Content theories of motivation emphasize the reasons that elicit behavior, that is, what causes it and what its intended purpose is. A content theory explains behavioral aspects in terms of specific human needs, specific values, or other factors that drive behavior and act as motives. Process theories of motivation focus on how the motives create arousal of a certain intensity, leading to a particular behavior, or how a person comes to act in a certain way. There is less emphasis on the specific factors that cause behavior (Tosi, Mero, and Rizzo, 2000;Foster, 2000).While the two-factor theory focuses on the motivation content, that is, the now classic duality between extrinsic and intrinsic factors that respectively decrease or increase motivation, the