The control factors, used to tweak the process, form the inner array.
The noise factors, associated with process or environmental variability, form the outer array.
Taguchi’s signal-to-noise ratios are functions of the observed responses over an outer array. The Taguchi platform supports all these features of the Taguchi method. You choose from inner and outer array designs, which use the traditional Taguchi orthogonal arrays, such as L4, L8, and L16.

Help created on 9/19/2017