Review Assumed Isolation

Assumed isolation is the belief that a test or trial system is cut off from live systems and real data, held without current evidence that the separation still holds.

People treat a system as a sandbox because it was labeled, configured, or described that way. They do not keep checking whether credentials, networks, tools, data, or deployment paths still connect it to production.

Isolation can decay as systems change. Safety depends on current evidence, not the memory of an earlier architecture decision.

A test agent is believed to use mock services, but a later configuration change gives it a production API credential through a shared secret store.

Assumed isolation is not verified isolation. A diagram, label, or original setup does not establish the present boundary.

Sandbox is a claim until tested.

* [[verification|Verification]] * [[independent-verification|Independent Verification]] * [[objective-escape|Objective Escape]] * [[state-transition-protocol|State Transition Protocol]]

* [NIST SP 800-53 Rev. 5, *Security and Privacy Controls for Information Systems and Organizations*](https://doi.org/10.6028/NIST.SP.800-53r5) — control SC-39 grounds the technical meaning of process isolation in separate execution domains. * [NIST SP 800-137, *Information Security Continuous Monitoring*](https://doi.org/10.6028/NIST.SP.800-137) — explains why control effectiveness requires ongoing visibility and reassessment rather than a one-time assumption. Together these sources support the mechanism behind this Renaissance Solutions term; neither source uses the label “Assumed Isolation.”

* Pair with [[independent-verification|Independent Verification]] and [[state-transition-protocol|State Transition Protocol]].