  While the LHC takes on the challenge of experimentally exploring the
electroweak symmetry breaking sector, it is not only interesting but also
crucial to explore alternatives to the Standard Model scenario with an
elementary scalar Higgs boson. The idea of electroweak symmetry breaking by
some new strong dynamics is discussed. A simple, general and self-consistent
low energy effective description of Higgsless models is introduced. This
effective theory is studied from the point of view of prolonging perturbative
unitarity of WW scattering by spin-1 resonances originating from the strongly
interacting sector. The LHC phenomenology and the discovery potential for these
spin-1 resonances is also discussed. The role of spin-1 resonances is then
considered on the grounds of composite Higgs models. A general prescription for
the explicit inclusion of such resonances in the effective Lagrangian
description of these models is presented.
