  The evidences for sigma(600) and kappa(900) observed in our analyses on the
pi pi and K pi scattering phase shift data are described, briefly. The analysis
have been performed by the interfering amplitude method, which satisfies the
unitarity requirement, using physically meaningful parameters. The introduction
of the negative phase shifts (repulsive force) are essential in the analysis.
New data for the pi0 pi0 scattering amplitudes and the I=0 S wave phase shifts
are presented. The data have been obtained in the pi-p charge exchange
reaction, pi- p --> pi0 pi0 n at 9 GeV by the E135 experiment at the KEK PS.
The amplitude analysis are performed. The behavior of the I=0 S wave phase
shifts below KKbar threshold are consistent with those of the pi+ pi-, so
called, standard data and those of the down-flat solution of the
CERN-Cracow-Munich polarization data. The analysis of the pi0 pi0 phase shift
data observes sigma(600) with the B-W parameters, M_sigma =588 +- 12 MeV and
Gamma_sigma =281 +- 25 MeV, which are in good agreement with those in our
analysis on the pi+ pi- data.
