operational qualification

**Operational qualification** is the **validation phase that demonstrates equipment subsystems operate correctly across intended ranges under controlled non-production conditions** - it proves functional capability before full process qualification. **What Is Operational qualification?** - **Definition**: OQ phase testing operational functions, control responses, alarms, and parameter ranges. - **Test Focus**: Motion accuracy, temperature control, pressure regulation, vacuum behavior, and safety interlocks. - **Execution Context**: Typically uses dry runs or non-product test conditions to isolate equipment function. - **Output Evidence**: Recorded pass-fail results against predefined acceptance criteria. **Why Operational qualification Matters** - **Function Verification**: Confirms subsystems work as intended before risking production wafers. - **Failure Prevention**: Exposes hidden control or hardware issues early in the lifecycle. - **Debug Efficiency**: Functional testing without product variables simplifies troubleshooting. - **Compliance Support**: Provides objective traceability for equipment validation decisions. - **Risk Reduction**: Improves confidence before moving into performance qualification. **How It Is Used in Practice** - **Range Testing**: Challenge operating setpoints across expected min-max envelopes. - **Alarm Validation**: Verify fault detection, interlock behavior, and safe-state transitions. - **Closure Discipline**: Resolve OQ deviations with documented retest before PQ start. Operational qualification is **the functional proof stage of equipment validation** - robust OQ execution prevents unstable equipment from advancing to production-critical process trials.