While separation of duties does apply, the principle of economy of mechanism indicates that creating multiple virtual servers on a single host with software like VMware is creating a complex system.

FORBES: Teach Your Boss to Speak Security: Economy of Mechanism

For that matter, social business as a software system is not all that a computationally complex problem.

FORBES: Thinking Ourselves Forward

The KDDI system, is able to detect more complex behaviour by using analytical software - held on a server back at base - to match patterns of common movements.

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