Abstract: In an example embodiment, roles within a job based security model are refactored to roles within a task oriented security model. The task oriented security model comprises task roles, which allow access to functionality and data, and enabler roles, which provide limits on the scope of the task roles. Data such as user assignment data, role to functionality mapping, functionality authorization objects, user identity and organizational data may be combined and normalized to create a mapping of users to functionality and organizational data. A refactoring engine may then examine the map to identify new candidate roles using contiguous regions of the map. Tuning parameters and constraints allow tuning of the candidate roles, and statistical metrics allow evaluation of the candidate roles. Candidate roles may be tested and applied in the new system.