The above analytical-graphical method provides a single-valued determination of the precision required for a tolerance controlling and measuring device for a given production process characteristicr, a field asymmetry coefficientk, and a probability characteristic (α, β, P1). Moreover, the precision determined by means of a single probability characteristic (for instance α) provides a single-valued determination of the remaining probability characteristics (β, P1) of the same products. The solution of straight and inverse problems by means of the above nomograms (see Figs. 1, 2 and 3) is equally simple.