  This Thesis is devoted to the phenomenological analysis at the large hadron
collider (LHC), as well at a future electron positron collider, of the 4
dimensional (4D) composite Higgs model (4DCHM), a compelling beyond the
standard model scenario where the Higgs state arises as a pseudo Nambu
Goldstone boson. The motivations and the main characteristics of the model are
summarised and then an analysis of the gauge and Higgs sectors of the 4DCHM is
performed. Finally we propose a general framework for the analysis of models
with an extended quark sector that we have applied to a simplified composite
Higgs scenario.
