  Within the context of a generalized linear sigma model that includes two
nonets of scalar mesons (a two-quark nonet and a four-quark nonet) and two
nonets of pseudoscalar mesons (a two-quark nonet and a four-quark nonet) a
collective description of scalar and pseudoscalar mesons below and above 1 GeV
is studied. The quark contents of these states are probed; estimates on their
quark components are extracted; and prediction for pi pi scattering amplitude
is made. An overview of these studies is presented here.
