[en] A way to solve the general problem of describing complicated property vs composition dependences in the method of crystalline quasiparticles is suggested. The method is described of dividing the whole concentration range (expressed by portion [0.1], if concentrations are given in molar-, weight-, volume fractions or by section [0.100], if concentrations present molar-, weight, volume content in percentage) into portions to obtain from the experiment a set of constants of quasichemical reactions. The main formulae are given for processing the experimental data and the properties of the suggested method, of processing. Particular cases of applying this method are considered using the example of describing the property-composition dependence of the TiC - HfN system