📉 RTT Facilities — Drift Scoring Rubric
Gradual Degradation & Governance Risk
This document defines the Facilities‑level drift scoring framework used to identify, classify, and govern gradual degradation across facilities systems.
It is grounded in the RTT Facilities Playbook and applies to all Facilities domains, including RTT‑AGERI.
Domain‑specific initiatives extend this rubric with asset‑specific indicators and measurement techniques.
1. Purpose#
Most infrastructure failures begin as drift, not events.
The purpose of this rubric is to:
- Detect gradual degradation before failure
- Distinguish normal aging from systemic risk
- Inform intervention timing and modernization cycles
- Prevent deferred risk accumulation
- Provide a shared drift vocabulary across domains
Drift is treated as a leading governance signal, not a maintenance inconvenience.
2. Drift Definition#
Drift is the gradual deviation of an asset, corridor, or system from its expected performance, condition, or risk profile over time.
Drift may be:
- Physical
- Operational
- Environmental
- Organizational
Drift is cumulative and often invisible without structured observation.
3. Scoring Scale#
Facilities drift is scored on a 0–4 scale:
| Score | Classification | Description |
|---|---|---|
| 0 | None | No detectable deviation from baseline |
| 1 | Low | Minor deviation within expected tolerance |
| 2 | Moderate | Persistent deviation requiring attention |
| 3 | High | Accelerating degradation increasing failure risk |
| 4 | Critical | Drift likely to trigger failure or propagation |
Scores reflect trend and persistence, not isolated anomalies.
4. Assessment Dimensions#
Drift scoring considers multiple dimensions:
- Performance variance
- Maintenance frequency and cost
- Environmental exposure
- Load and usage changes
- Historical failure correlation
- Organizational or procedural erosion
Not all dimensions apply to every asset class.
5. Drift Patterns#
Common drift patterns include:
- Slow material degradation
- Incremental capacity loss
- Increasing operational workaround reliance
- Deferred modernization masked by maintenance
- Governance or documentation decay
Pattern recognition is as important as measurement.
6. Governance Thresholds#
Drift scores trigger governance responses:
| Score | Governance Response |
|---|---|
| 0–1 | Monitor |
| 2 | Preventive intervention review |
| 3 | Modernization prioritization |
| 4 | Escalation and immediate action |
Thresholds may be refined by domain‑specific initiatives.
7. Integration with Other Frameworks#
Drift scoring integrates with:
- Harmonics scoring
- Propagation modeling
- Failure mode catalog
- Intervention playbook
- Modernization cycle matrix
- Audit protocols
Drift is often the earliest detectable signal in failure cascades.
8. Lifecycle Alignment#
Drift is assessed across lifecycle phases:
- Design / Construction — standards deviation
- Operation / Maintenance — performance and wear
- Modernization — residual risk
- Decommissioning — safety and continuity risk
Lifecycle‑blind drift assessment is treated as a governance failure.
9. Relationship to Domain‑Specific Rubrics#
Domain initiatives (e.g., RTT‑AGERI):
- Extend this rubric with asset‑specific indicators
- Define measurement techniques and tolerances
- Map drift scores to domain‑specific interventions
They do not redefine the scoring scale or governance thresholds.
10. Canonical Status#
This rubric is canonical.
All Facilities domains must reference it when assessing gradual degradation and planning intervention.