Efficacy and profitability of results and eventually the conclusions of an experiment were found to depend on the statistical model for organizing an experiment. No thoroughgoing studies have been reported to date in our statistical literature on Latin square designs, one of the three basic experimental designs.

To plan an experiment means to decide how to observe and measure in order to minimize randomized variations and stress the effects of the factors analyzed. Namely, it is of major importance to minimize experimental errors. Thus, the experimental design is expected to meet some of the principles stated in order to minimize experimental errors. Local control is one of the principles anticipated to be met by an experimental design.