Comparison of correlations of identical pions in different reference frames

It is shown that by comparison of the correlations of identical pions in reference frames moving with different velocities along the reaction axis it is possible to distinguish the frame in which there is kinematical symmetry of the multiple production process. This is possible because in the ''symmetric frame'' the space-time parameters R and tau are extremal. The discrimination of the symmetric frame can prove useful in experiment for choosing between competing models of multiple production