  We show that the \kappa, a_0(980), \sigma and the f_0(980) resonances
constitute the lightest scalar nonet in three different and complementary ways.
First, by establishing the continuous movement of the poles from the physical
to a SU(3) limit. Second, by performing an analysis of the couplings of the
scalar mesons to pairs of pseudoscalars and third, by analysing the couplings
of the scalars with meson-meson SU(3) scattering eigenstates. Every of the last
two methods agree that the mixing angle between the singlet and the octet I=0
states is \theta= 19^o\pm 5 degrees, so that the \sigma is mainly the singlet
and the f_0(980) the isosinglet octet state.
