In the Methodology of Experimental Research (M.E.R.), the quality of the re
sults depends on the choice of the experimental design. A lot of experiment
al designs exist. The goal of the presentation is to optimize the choice of
an experimental design by neural networks. We present in detail the elabor
ation of networks which facilitates the choice of an experimental design as
a second-degree model which studies six factors in the spherical experimen
tal domain.