criticality analysis

**Criticality analysis** is the **method of ranking equipment and components by consequence of failure, likelihood, and recoverability** - it guides where maintenance, spares, and redundancy investment should be concentrated. **What Is Criticality analysis?** - **Definition**: Structured scoring of asset importance based on safety, throughput, quality, and recovery-time impact. - **Ranking Output**: Tiered categories such as critical, essential, and non-critical assets. - **Decision Link**: Determines maintenance rigor, spare stocking, inspection frequency, and escalation rules. - **Data Inputs**: Historical failures, process bottleneck status, lead times, and dependency mapping. **Why Criticality analysis Matters** - **Focus Efficiency**: Prevents equal treatment of assets with very different business impact. - **Downtime Risk Reduction**: High-criticality assets receive stronger preventive and contingency controls. - **Budget Optimization**: Aligns reliability spending with consequence-driven priorities. - **Operational Transparency**: Makes risk tradeoffs explicit for production and leadership teams. - **Response Readiness**: Criticality tiers improve incident triage speed during outages. **How It Is Used in Practice** - **Scoring Framework**: Define weighted criteria and thresholds for tier assignment. - **Policy Mapping**: Attach standard maintenance and spare policies to each criticality tier. - **Review Cycle**: Reassess criticality after capacity shifts, tool aging, or product mix changes. Criticality analysis is **a foundational reliability planning tool for complex fabs** - accurate ranking ensures protection resources are applied where failure consequences are highest.