  We develop a simple description of models where electroweak symmetry breaking
is triggered by a light composite Higgs, which emerges from a
strongly-interacting sector as a pseudo-Goldstone boson. Two parameters broadly
characterize these models: m_rho, the mass scale of the new resonances and
g_rho, their coupling. An effective low-energy Lagrangian approach proves to be
useful for LHC and ILC phenomenology below the scale m_rho. We identify two
classes of operators: those that are genuinely sensitive to the new strong
force and those that are sensitive to the spectrum of the resonances only.
Phenomenological prospects for the LHC and the ILC include the study of
high-energy longitudinal vector boson scattering, strong double-Higgs
production and anomalous Higgs couplings. We finally discuss the possibility
that the top quark could also be a composite object of the strong sector.
