This paper claims that current work motivation theories are restricted in certain respects due to their overreliance on individualistic-hedonistic assumptions and their over-emphasis of cognitive-calculative processess. It is suggested that a self-concept based theory should be added to the existing core of theories in order to overcome their limitations. Certain assumptions about the relationships between the self-concept and behaviour are presented, followed by a series of theoretical propositions and some research suggestions. The implications of the theory for organizational commitment, collective work behaviour, transformational leadership and symbolic management are briefly discussed.