**Advantages of Experimental Designs (ED)** (**Figure 4**)

• Increased innovation as a result of process improvement.

• Fewer batch errors.


Inner 23 and outer 22 arrays of Taguchi design


#### **Table 3.**

*Experimental designs used during formulation by design (FbD) [18].*


#### **Uses of Experimental Designs (ED).**

It is used to discover the causes behind the variance in the response, to identify the circumstances in which the desired (maximum or minimum) response is obtained, to contrast responses at various levels of controlled variables, and to create a model for predicting response.
