In this thesis, helping behavior is defined as extra role behaviors that an employee performs voluntarily and contributes to organizational effectiveness such as improved productivity and co-worker performance (Organ, 1988). People who help others at work tend to experience increased job satisfaction, increased organizational commitment and decreased intentions to leave the job. Taking into consideration the benefits of helping outcomes to both employees and organizations, I developed six scales that measure helping using a multi-stage item-development procedure. Based on a theoretical model distinguishing emotional- and instrumental helping, a multidimensional measure could not be developed. In this study, however, empirical support was found for two helping scales and criteria of interest. Future directions and implications of this study are discussed.