  Symmetries affected by the anomaly do not survive quantization and cannot be
understood classically. They are of fundamental importance and offer an
opportunity of expanding the theoretical framework. We examine the theory of
the anomalous sector, starting from lowest order Chiral Perturbation Theory
(ChPT), leading up to the construction of the recently developed Lagrangian of
$\mathcal{O}(p^{6}) $ describing anomalous processes. This Lagrangian contains
a set of chiral coefficients that must be determined phenomenologically. Using
currently available experimental data, we fit as many of these coefficients as
possible. The results of the ChPT treatment are then used to test the validity
of the two main alternative models employed in the anomalous sector - Vector
Meson Dominance (VMD) and the constituent Chiral Quark Model (CQM).
