| Class |
Short description |
|---|---|
| SCP exposure to a population |
|
| AK | Population does not become aware of the SCP |
| BK | Population does become aware of the SCP |
| CK | Population does not become aware of the SCP, but its presence causes significant geo-political shifts |
| DK | Population does become aware of the SCP and its presence causes significant geo-political shifts |
| CK / DK | The definition of "significant geo-political shifts" includes (but is not limited to): War, economic collapse, regime change, and/or shifts in diplomatic relations between nations |
| EK | Presence of the SCP causes public awareness of The Foundation |
| Self-sustaining paradoxes | |
| FK | Harmful by-products do not result from its existence / removal |
| GK | Harmful by-products do result from its existence / removal |
| Unstable paradoxes | |
| HK | Harmful by-products do not result from its existence / removal |
| IK | Harmful by-products do result from its existence / removal |
| Species transmutation / significant genetic alteration | |
| JK | Victim counts are <0.00001% of the affected population |
| KK | Victim counts are 0.001–50% of the affected population |
| LK | Victim counts are >50%, but <100% of the affected population |
| MK | Victim counts are 100% of the affected population |
| SCP gains control over X | |
| NK | SCP controls <50% of the population |
| OK | SCP controls >50%, but <100% of the population |
| PK | SCP controls 100% of the population |
| Societal constructs are affected | |
| QK | Minor societal construct breaks down, <1,000,000 individuals affected |
| RK | Major societal construct breaks down, >1,000,000 individuals affected |
| SK | Essential social structure breaks down, entire population affected |
| TK | All societal constructs break down / civilization as we know it ceases to exist |
| Extinction events – Level 1 | |
| UK | A region with a (former) population of >1,000,000 individuals can no longer support life |
| VK | Earth's population drops <25% |
| Extinction events – Level 2 | |
| WK | Earth is altered in a way that it can no longer support life |
| XK | Our solar system is altered in a way that it can no longer support life |
| YK | The Milky Way galaxy is altered in a way that it can no longer support life |
| ZK | The universe is altered in a way that it can no longer support life |
| ΩK | The universe as we know it ceases to exist |