1, security level: SCP is an exception that can be easily and safely accommodated. This is usually because the foundation has done enough research on SCP, so that it doesn't need a lot of resources to accommodate it, or it needs a specific and intentional activation or trigger method. However, the SCP rated as safe does not mean that it will not pose a threat when operating or starting.
2. Euclid level: SCP is an anomaly that requires more resources to fully adapt, or its adaptation is not always reliable. Usually this is because SCP is not fully understood or unpredictable in nature. Euclid is the largest project level, and if SCP is not easily classified into other standard project levels, it will usually be classified into this category.
3.Keter level: SCP is an anomaly that is extremely difficult to adapt continuously or reliably, and the adaptation measures are often large and complex. Due to the lack of substantive understanding of abnormal phenomena, or the lack of appropriate technology to adapt or resist abnormal phenomena, foundations usually cannot successfully adapt to these SCPs. A division-level SCP does not mean that SCP is dangerous, but it is only difficult or expensive to accommodate.
4. Thaumill level: SCP is used by the Foundation to adjust or resist other SCPs or abnormal situations. The only remaining Thaumiel-level project is the top secret of the Foundation, and its location, function and current situation are only known by a few Foundation members outside the O5 Parliament.
5. A failed SCP is an abnormality that has been intentionally or unintentionally destroyed or failed, and it is no longer abnormal.