Relativity theory formulation is proposed, based not on the axiomatic postulation of its main principles but on their inference out of a thought experiment. With this approach, the experimentally observed independence of the speed of light from the motion of source and observer is a necessary consequence of the finiteness of propagation speed of all kinds of information. The mechanism of relativistic effects origination is described; the formulas of Lorentz transformations, Doppler quadratic

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... ect, electromagnetic interaction and centrifugal force of inertia are derived. Keywords The Principle of Relativity, The Measurement Process, Lorentz Group, Doppler Effect, Mach's Principle Judgements of any theory concern the correlations between solid bodies (coordinate systems), clocks and electromagnetic processes. Insufficient understanding of this fact is the root of those difficulties which the electrodynamics of the moving bodies has to overcome now. Albert Einstein