The tutorial is intended for the first acquaintance with the planning of the experiment. It does not require any prior knowledge of the subject. Of course, it is assumed that the reader has not forgotten the school course of mathematics and is ready to spend time to get acquainted with the subject. Since the planning of the experiment is used in all empirical sciences, the manual uses exclusively household examples, which does not prevent the reader from adapting its results to his field of practical research. The bibliography provides some works that may serve interested readers for further reading. Initially, most of the materials of this manual were published in separate articles in the journal "Modern Laboratory Practice", and the author received permission to use the materials of these publications. Designed for undergraduate and graduate students of all specialties. ;Griff:Admitted by the educational and methodological association for education in the field of metallurgy as a teaching aid for students of higher educational institutions studying in the direction of Metallurgy