What-If and Scope

Honest Defect-Rate Scope

The final lesson states the boundary: deterministic defect-rate arithmetic only.

highlighted = computed this step

Deterministic Arithmetic

The model uses deterministic units, opportunities, and defect counts.

deterministic defect-rate arithmetic\text{deterministic defect-rate arithmetic}
DPMO snapshotThe same chart shows the base snapshot and the lower-defect what-if.what-if DPMO snapshotDPO 1/50; DPMO 20000measurevaluemeaningunits100checked unitsopportunities per unit4defect chances per unittotal opportunities400units times opportunitiesdefects8observed defectsDPO1/50defects per opportunityDPMO20000DPO times one millionbase defectsbase defects 8what-if defectswhat-if defects 5base DPMObase DPMO 20000what-if DPMOwhat-if DPMO 12500what-if DPO 1/80; DPMO 12500; reduction 7500

No Sigma Conversion

It does not convert DPMO to sigma or prove capability.

sigma conversion outside scope\text{sigma conversion outside scope}
DPMO snapshotThe same chart shows the base snapshot and the lower-defect what-if.what-if DPMO snapshotDPO 1/50; DPMO 20000measurevaluemeaningunits100checked unitsopportunities per unit4defect chances per unittotal opportunities400units times opportunitiesdefects8observed defectsDPO1/50defects per opportunityDPMO20000DPO times one millionbase defectsbase defects 8what-if defectswhat-if defects 5base DPMObase DPMO 20000what-if DPMOwhat-if DPMO 12500what-if DPO 1/80; DPMO 12500; reduction 7500

No Root Cause Claim

It does not find root causes or make a sampling claim.

root cause and sampling outside scope\text{root cause and sampling outside scope}
DPMO snapshotThe same chart shows the base snapshot and the lower-defect what-if.what-if DPMO snapshotDPO 1/50; DPMO 20000measurevaluemeaningunits100checked unitsopportunities per unit4defect chances per unittotal opportunities400units times opportunitiesdefects8observed defectsDPO1/50defects per opportunityDPMO20000DPO times one millionbase defectsbase defects 8what-if defectswhat-if defects 5base DPMObase DPMO 20000what-if DPMOwhat-if DPMO 12500what-if DPO 1/80; DPMO 12500; reduction 7500

Honesty Note

This is deterministic defect-rate arithmetic only. It does not convert to sigma, prove capability, find root causes, or make a sampling claim.

defect-rate arithmetic only\text{defect-rate arithmetic only}
DPMO snapshotThe same chart shows the base snapshot and the lower-defect what-if.what-if DPMO snapshotDPO 1/50; DPMO 20000measurevaluemeaningunits100checked unitsopportunities per unit4defect chances per unittotal opportunities400units times opportunitiesdefects8observed defectsDPO1/50defects per opportunityDPMO20000DPO times one millionbase defectsbase defects 8what-if defectswhat-if defects 5base DPMObase DPMO 20000what-if DPMOwhat-if DPMO 12500what-if DPO 1/80; DPMO 12500; reduction 7500