According to Miles and Snow (1996), the twentieth-century structure of pyramid
organizations created ’second wave’ careers characterized by the incremental acquisition over time of responsibility, status and formal rewards. More recently, network organizations with fluid and permeable boundaries have generated ’third wave’careers, identified by horizontal rather than vertical movement. For the future, it is possible to conceive of careers developing more reciprocal relationships with organizational forms. Miles and Snow (1996) describe employment relationships of the future as a fourth wave of enterprise development in which individual work 0 will drive organizational form rather than following it.