A security page at the ISACA website links to three resources on convergence between physical and information security:
1. A survey by Deloitte & Touche addresses the value of security as part of enterprise risk management and the benefit of a converged view of security in managing enterprise risk. Security executives provided insight into the general state of security convergence, integration of converged security as part of ERM, the role of risk councils and the benefit that a strategy for converged risk management plays in breaking down communications barriers.
2. Convergent Security Risks in Physical Security Systems and IT Infrastructures describes how enterprises are facing the risks that arise when physical and IT security risks collide.
3. Convergence of Enterprise Security Organizations is a Booz-Allen-Hamilton study examining how enterprises are addressing the converged issues surrounding their security.