In some Gamma-Ray Bursts (GRBs) it has been possible to identify diffe
rent time scales of variability. Certainly such a behaviour can easily
he revealed in strong events, but it might represent a general behavi
our of the GRBs. In this paper we report results of temporal variabili
ty for 5 events, 2 recorded by the previous experiments SIGNE and KONU
S and 3 by the experiment BATSE on board the CGRO satellite. This kind
of analysis up to date can give new information to understand the ori
gin of GRBs and the relative scenario of the burst energy emission.