  It is shown that the new observed redshift distributions of various
flux-limited samples of radio sources in general are consistent with the
predictions of two basic evolutionary models published by Condon (1984) and
Dunlop and Peacock (1990), i.e. none of them can be rejected at the confidence
level of about 95 per cent. However, the models allowing a free-form evolution
and suggesting both density and luminosity evolution are more consistent with
the observational data at lower redshifts, while the 'pure luminosity
evolution' model fits better the data at higher redshifts. This leads to a
suspicion that the same evolution governing all radio sources, suggested by
Condon (1984), might not be the case.
