The information about the reliability of the quality control of dry building mixes on an example of a light plaster density less than 1300 kg/m3 at the control of six parameters (density, flexibility, water retention, compressive strength, water absorption during capillary leak, adhesion strength). It is shown, that at the control of all six parameters of quality reliability of the control is P = 0.96 - 0.98 at depending from standard deviation error measurement. When during acceptance tests each batch of DPM is not controlled by the adhesion strength reliability of the control is P = 0,82-0,83, well below the permitted values. Proposed indication include the measurement of adhesive strength at the acceptance tests at the control of each batch of DPM.

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