Defense In Depth

---
name: defense-in-depth
description: Use when designing verification strategy so independent gates cover requirements, implementation, security, validation, and judgment without claiming perfect certainty.
---

# Defense in Depth

Design independent, diverse checks so a defect must survive multiple uncorrelated gates.

## Gate design
- Assign an owner.
- Define independence from the implementation author.
- State machine-checkable pass criteria.
- Set loop limits.
- Record evidence and residual risk.

Avoid saying a workflow is 100% safe; report coverage and remaining uncertainty.