A system and method are provided for adaptive approximating of a user for role authorization in a hierarchical inter-organization model. The system includes an authorization redirector for receiving a request for an access control decision for a user. The system further includes an adaptive authorizer for dynamically determining, at run-time, a user role approximation for the user responsive to the request. The user role approximation is based on at least one of a system state and a system goal corresponding to a hierarchical inter-organizational model.
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