  One of the solutions to the hierarchy problem of the Standard Model is the
composite Higgs scenario, where the Higgs emerges as a composite
pseudo-Nambu-Goldstone boson. In this work we present and study the basic
characteristics of the composite Higgs scenario, based on the $SO(5)/SO(4)$ and
$SO(6)/SO(5)$ cosets. We construct their effective Lagrangians through the
Callan-Coleman-Wess-Zumino construction. The first coset does not differ much
from the Standard Model and the second contains a singlet scalar in addition to
the Higgs doublet. In these models we study the gauge sector, the fermion
sector and we estimate the composite Higgs potential.
