learn.howToCalculate
learn.whatIsHeading
Measures process consistency using statistical defect rates. Six Sigma means 99.99966% of outputs meet specifications.
Guida passo passo
- 1Measure process output distribution (mean, standard deviation)
- 2Define upper and lower specification limits
- 3Calculate sigma level: (specification limit - mean) ÷ std deviation
- 4Fewer defects = higher sigma level
Esempi risolti
Ingresso
1M parts, 3.4 defects
Risultato
6-sigma
Errori comuni da evitare
- ✕Not accounting for process drift over time
- ✕Using non-normal distributions without transformation
Domande frequenti
What sigma level is acceptable?
3-sigma: 66,000 defects per million; 4-sigma: 6,200 defects; 6-sigma: 3.4 defects per million.
Is Six Sigma achievable?
Few processes achieve true 6-sigma; most aim for 4-sigma; improvement is gradual.
Pronto per calcolare? Prova la calcolatrice gratuita di Six Sigma
Provalo tu stesso →