In this paper, we develop a model for engineering role-permission assignment. Our model builds upon the well-known RBAC96 model [SCFY96]. Assigning permissions to roles is considered too complex an activity to accomplish directly. Instead we advocate breaking down this process into a number of steps. We specifically introduce the concept of Jobs, Work-patterns, and Tasks to facilitate rolepermission assignment into a series of smaller steps. We describe methodologies for using this model in two different ways. In a top-down approach, roles are decomposed into permissions, whereas in a bottom-up approach, permissions are aggregated into roles. 1
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