Rich experimental data have been collected in heavy-ion collisions at high
energies to study the properties of strongly interacting matter. As the theory
of strong interactions, QCD, predicts asymptotic freedom, the created matter at
sufficiently high temperature and density will be dominated by a state of
quasi-free quarks and gluons referred to as the Quark-Qluon Plasma (QGP).
Experimental signals for the onset of the QGP creation (the onset of the
deconfinement) have been predicted within the statistical model for the early
stage of nucleus-nucleus collisions. In this model the existence of two
different phases is assumed: confined mater and the QGP, as well as a first
order phase transition between them. Until recently, these predictions were
confirmed only by the NA49 experiment at the CERN SPS. In this report recent
results from STAR at RHIC/BNL and from ALICE at LHC/CERN, related to the onset
of deconfinement, will be compared to published results from NA49