The present invention relates to a method for access decision evaluation in a building automation and control system, the method comprising: sending, from an accessing device (10) to an accessed device (20), an access request, sending, from the accessed device (20) to a central decision evaluation apparatus (30), an evaluation request asking if the access request is granted or denied, evaluating, at the central decision evaluation apparatus (30), the evaluation request using one or more central access control policies in order to reach a decision on if the access request is granted or denied, deriving, at the central decision evaluation apparatus (30), the one or more central access control policies that was used for evaluation into a device specific access policy, sending, from the central decision evaluation apparatus (30) to the accessed device (20), the decision and the device specific access policy, and storing, at the accessed device (20), the device specific access policy.
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