Users’ privacy preferences are needed in order to get users privacy demands and to give them control capabilities of how they want their information to be dealt with. In context aware systems, users’ privacy preferences are expected to be influenced by their changing context. Consequently, new ways of describing privacy preferences are required to handle users’ context dynamics. In this paper, we propose architecture for users’ privacy preferences description and evaluation in context aware systems. A simulation tool is being also developed which introduces the architecture functionalities.