  I discuss methods to identify the presence of dicrete symmetries in the
two-Higgs-doublet model by observing the masses and the cubic and quartic
interactions of the scalars. The symmetries considered are a $ Z_2 $ symmetry
under which $ \phi_2 \rightarrow - \phi_2 $, and a CP symmetry which enforces
real coupling constants in the Higgs potential. Those symmetries are
spontaneously broken, and the $ Z_2 $ symmetry may also be softly broken. I
identify the signatures in the interactions of the scalars that these
symmetries leave after their breaking.
