The paper presents thesis which are the basis for development of new directions of in situ tests for assessment of structure and properties of the subsoil. New technologies were discussed, including Icone system in static penetration method by ap van den Berg from the Netherlands. The paper comments also constructions of hybrid systems for performance of static penetration tests with drillings and hybrid model of cylindrical penetrometer combined with seismic tests. New constructions for execution of seismic dilatometer tests on sea and coastal areas are also presented. The paper also discussed uncertainties of in situ and laboratory tests and its influence on the assessment of mechanical parameters of the subsoil.

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