| Level 1 Self-Assessment | Level 2 Self-Assessment | Level 2 C3PAO Assessment | |
|---|---|---|---|
| Handles | FCI only (no CUI) | CUI in a defined enclave | CUI in a defined enclave |
| Framework | 17 practices (FAR 52.204-21) | 110 practices (NIST SP 800-171 r2) | 110 practices (NIST SP 800-171 r2) |
| Who assesses | Contractor self-attests annually | Contractor self-assesses; affirms in SPRS | C3PAO conducts formal assessment |
| SPRS required | No | Yes — score must be current and defensible | Yes — reviewed during C3PAO assessment |
| SSP required | No formal SSP required | Yes — SSP must reflect current environment | Yes — SSP is central evidence artifact |
| Lumos support | Scope clarification, FAR review | SPRS scoring, SSP build, gap analysis, POA&M | Full readiness prep: SSP, evidence package, POA&M, pre-assessment review |