We focus on the way a business process manager treats the risks affecting a supervised business process. A descriptive model of the individual decision making process is proposed. This model mainly results from the integration, in the model of decision making by the search for a dominance structure, of the social aspect of the business process manager activity. In order to do this, we adopt a constructive and constructivist approach concerning the definition by the business process manager of his representation of the risk treatment strategy that has to be implemented.