Purpose
As regards level-classification of hadrons, there exist two contrasting,
non-relativistic and relativistic, viewpoints. The former has been a base
for the PDG level-classification scheme adopted for the last 4 decades.
The property of $\pi$-meson as a Nambu-Goldstone boson associated with spontaneous
breaking of chiral symmetry gives a support to the latter. Recently existence
of the light-mass iso-scalar scalar meson, which has been controversial
for many years,is widely accepted; as a matter of fact, all speakers in
the workshop ``$\sigma$-Meson 2000" (Kyoto) ``took the light $\sigma$ for
granted". It also appears as ``$f_0(600)$ or $\sigma$" in the newest edition
of the PDG list.
Physical implication of the existence of $\sigma$ is important and
it gives further support to the relativistic view.Thus, the hadron spectroscopy
is now being confronted with a serious problem in unifing the above two
contradictory viewpoints. For solving this, it seems necessary to pursue
the
relativistic viewpoint in a more basic level, such as a covariant description
of bound systems with chiral symmetry being taken into account. The purpose
of this symposium is to review the present situation on the hadron spectroscopy
and to find a clue to its further development.