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Object Classes

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Safe: Safe-class SCPs are anomalies that are easily and safely contained. This is often due to the fact that the Foundation has researched the SCP well enough that containment does not require significant resources or that the anomalies require a specific and conscious activation or trigger. Classifying an SCP as Safe, however, does not mean that handling or activating it does not pose a threat.

Euclid: Euclid-class SCPs are anomalies that require more resources to contain completely or where containment isn't always reliable. Usually, this is because the SCP is insufficiently understood or inherently unpredictable. Euclid is the Object Class with the greatest scope, and it's usually a safe bet that an SCP will be this class if it doesn't easily fall into any of the other standard Object Classes.
As a note, any SCP that's, and/or is generally classified as Euclid, due to the inherent unpredictability of an object that can act or think on its own.

Keter: Keter-class SCPs are anomalies that are exceedingly difficult to contain consistently or reliably, with containment procedures often being extensive and complex. The Foundation often can't contain these SCPs well due to not having a solid understanding of the anomaly, or lacking the technology to properly contain or counter it. A Keter SCP does not mean the SCP is dangerous, just that it is simply very difficult or costly to contain.

Thaumiel: Thaumiel-class SCPs are anomalies that the Foundation specifically uses to contain other SCPs. Even the mere existence of Thaumiel-class objects is classified at the highest levels of the Foundation and their locations, functions, and current status are known to few Foundation personnel outside of the O5 Council.

Neutralized: Neutralized SCPs are anomalies that are no longer anomalous, either through having been intentionally or accidentally destroyed, or disabled.

The Locked Box Test  by Research Assistant Williams
The Locked Box Test is an informal guideline used to determine an object's most appropriate Object Class. It goes like this:

If you lock it in a box, leave it alone, and nothing bad will happen, then it's probably Safe. If you lock it in a box, leave it alone, and you're not entirely sure what will happen, then it's probably Euclid. If you lock it in a box, leave it alone, and it easily escapes, then it's probably Keter. If it is the box, then it's probably Thaumiel.

Note that as a special consideration, something that is autonomous, alive, and/or sapient is almost always at least Euclid-class. That is, if you lock a living thing in a box and forget about it, it will eventually suffocate or starve to death, and that's not a good outcome. Something that is intelligent could also end up being smart enough to outwit its containment procedures and/or stop cooperating with the Foundation's attempts to contain it, making it more dangerous than it otherwise might be.

Authors Note: Credit to the SCP Foundation Wiki for the Object Classifications, descriptions, and the Locked Box Test.