Accept/reject criteria is predefined rules that determine pass or fail outcomes for reliability tests based on observed failures and confidence goals - Criteria map statistical outcomes to actionable decisions such as release rework or redesign.

What Is Accept/reject criteria?

• Definition: Predefined rules that determine pass or fail outcomes for reliability tests based on observed failures and confidence goals.
• Core Mechanism: Criteria map statistical outcomes to actionable decisions such as release rework or redesign.
• Operational Scope: It is applied in semiconductor reliability engineering to improve lifetime prediction, screen design, and release confidence.
• Failure Modes: Ambiguous criteria can create inconsistent decisions across teams and programs.

Why Accept/reject criteria Matters

• Reliability Assurance: Better methods improve confidence that shipped units meet lifecycle expectations.
• Decision Quality: Statistical clarity supports defensible release, redesign, and warranty decisions.
• Cost Efficiency: Optimized tests and screens reduce unnecessary stress time and avoidable scrap.
• Risk Reduction: Early detection of weak units lowers field-return and service-impact risk.
• Operational Scalability: Standardized methods support repeatable execution across products and fabs.

How It Is Used in Practice

• Method Selection: Choose approach based on failure mechanism maturity, confidence targets, and production constraints.
• Calibration: Document criteria before testing and verify decision consistency with independent review.
• Validation: Monitor screen-capture rates, confidence-bound stability, and correlation with field outcomes.

Accept/reject criteria is a core reliability engineering control for lifecycle and screening performance - It enforces disciplined and reproducible reliability governance.