Abstract
Nucleus-Nucleus collisions at high energies produce hadronic systems at high energy and particle number densities. Single particle observables are used to study the reaction dynamics[1]. Information about the space and time configuration of the zone, in which the particles are produced, can be obtained from particle correlations. In this contribution we discuss in very simple terms how this information is extracted from the experimental data on two-pion correlations and show that different correlations are expected for static and (longitudinally) expanding sources. For a comprehensive description of the techniques of source size measurements the reader is deferred to references [2,3].
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