Application of modern methods of the theory of fuzzy sets and the theory of decision-making to a problem of construction of an integral index of safety in multicriteria spatio-textual signs on the basis of axiomatically entered concept of sufficiency is considered. The ways of constructing a complex index of safety in the production of lifting machines using computer algorithms that al-low a qualitatively new level to solve the problem of processing a large amount of information necessary to improve the reliability of the estimates. The proposed method can be adapted for specific objects by expanding or changing the multi-criteria space of particular features that characterize the safety of operation of these objects in real conditions.