In the safe physical human-machine interaction the compliance of technical systems is an elementary requirement. The physical compliance of technical systems can be provided either by control functions implementation and/or intrinsic by structural configuration and material properties optimization. The latter is advantageous because of higher reliability as well as general simplicity of the design and production technologies. In the paper we focus on mechanical systems with intrinsic mechanical compliance. In general the deformability of structures is primarly characterised by their stiffness. Compliant mechanisms are mechanisms, whose functionality is based on its deformability. The goal of each engineer is by the design of mechanisms the setting of compliance depending upon the purpose of its application. It should be considered, that the compliance is dependent on a variety of parameters. The optimal design of these mechanisms can be realized only with precise knowledge of the influence parameters and possible types of compliance.