Start

Variable orAttribute?

Defects orDefectives?

Constant sample size (n)?

Constant area of

opportunity?

c-chart u-chartp-chartnp-chart

Xbar -S chart

IMR chart Xbar-R chart

Is n fixedand n<10?

AttributeVariableNo

Yes

2<=n<=9n=1DefectsDefectives

Yes No

Yes No

Control Chart Roadmap

n = sample size orsubgroup size

# Defective Units (DU) Proportion of DU # Mistake/100 Unit # Mistakes/Unit