How do you design diverse protection systems to address common cause failures?

Diverse protection design: identify common cause vulnerabilities (technology, design, environmental, human factors), implement diversity at appropriate levels - measurement diversity (different physical principles, e.g., pressure and temperature for same hazard), equipment diversity (different manufacturers or models), functional diversity (different parameters measuring same process condition), human diversity (different operators for calibration/testing), and temporal diversity (staggered testing schedules). Challenges: increased complexity, maintenance burden, potential for diverse failures. Quantify CCF reduction through beta factor adjustment. Document diversity rationale and ensure it is maintained through lifecycle (no inadvertent convergence during replacements). Diversity most critical for SIL 3 and above applications.