Over the last decade there was a high interest in business process modeling in organizations. In their majority workflow systems support a role-based allocation of work to actors. This allocation does not consider the additional work wich comes from the actors environement ande wich is not visible to the workflow management system. In fact, the WFMS is not aware of the real workload of human resources in the organization. In this paper we propose an actor-driven approach for business processe management which aims at taking into account the additional work generated by the environment (telephone, fax, mail, verbally) and thus the the real workaload of actors