Information theory approach (extensive and nonextensive) to high energy multiple production processes

We present an overview of information theory approach (both in its extensive and nonextensive versions) applied to high energy multiparticle production processes. It will be illustrated by analysis of single particle distributions measured in proton-proton, proton-antiproton and nuclear collisions. We shall demonstrate the particular role played by the nonextensivity parameter q in such analysis as summarizing our knowledge on the fluctuations existed in hadronizing system.