be used in the prediction of the viscosity. From Table 1, the {3,2} simplex lattice model is not sufficient to optimize for the viscosity because the MAPE is unacceptable and the p value for the model equation is not significant. The {3,3} simplex lattice without an interior point also shows relatively high R2 and adjusted R2; however, the high MAPE is defined only as a good model, which can still be applied for screening the viscosity in the microemulsion system. The equation of the kinematic viscosity screening model can be used in two models: the {3,3} simplex lattice and the {3,3} simplex lattice augmented with interior points (Eqs. (2) and (3), respectively). However, the full cubic model of the {3,3} lattice augmented with interior points and a centroid displayed the lowest residual and is the most appropriate for optimizing the kinematic viscosity (KV).