This will not answer your question, but may be of interest: One other omnipresent issue is the lack of security, because delegation of authority is not secure

This will not answer your question, but may be of interest: One other omnipresent issue is the lack of security, because delegation of authority is not secure in systems with identity based access control. Maybe have a look at: Robust Composition: Towards a Unified Approach to Access Control and Concurrency Control http://www.erights.org/talks/thesis/markm-thesis.pdf http://www.erights.org/talks/thesis/markm-thesis.pdf Or, for a shorter introduction: http://waterken.sourceforge.net/aclsdont/current.pdf http://waterken.sourceforge.net/aclsdont/current.pdf