Designing privacy-aware systems gains much attention in recent years. One of the main issues for the protection of users' privacy is the proper selection and realization of the respective Privacy Enhancing Technologies for the realization of the privacy requirements identified in the design phase. The selection of PETs must be conducted in a way that best fits the organization's needs as well as other organization's criteria like cost, complexity etc. In this paper the PriS method, which is used for incorporating security and privacy requirements early in the system development process, is extended by combining knowledge from a soft computing approach in order to improve the way that respective PETs are selected for the realization of the respective requirements incorporated during the design phase.