The mechanism of electroweak symmetry breaking in Little Higgs Models
is analyzed in an effective field theory approach. This enables us to
identify observable effects irrespective of the specific structure and
content of the heavy degrees of freedom. We parameterize these
effects in a common operator basis and present the complete set of
anomalous contributions to gauge-boson, Higgs, and fermion couplings.
If the hypercharge assignments of the model retain their standard
form, electroweak precision data are affected only via the S and T
parameters and by contact interactions. As a proof of principle, we
apply this formalism to the minimal model and consider the current
constraints on the parameter space. Finally, we show how the
interplay of measurements at LHC and a Linear Collider could reveal
the structure of these models.
