  Setting aside anthropic arguments, there is no reason for CP symmetry to be
obeyed within the theory of quantum chromodynamics. However, no such violation
of CP symmetry has ever been observed in a strongly interacting experiment.
This is known as the strong CP problem which, in its simplest manifestations,
can be quantitatively formulated via a calculation of the pion masses and the
neutron electric dipole moment. The former yields a larger mass for the neutral
pion than its charged counterparts, the latter yields a far larger result than
is experimentally measured, where in both cases the discrepancies are
parameterised by the physical quantity $\bar{\theta}$. The strong CP problem
can be solved via the inclusion of a new particle, the axion, which dynamically
sets $\bar{\theta}$ to zero, eliminating these two manifestations. Thus,
experimental searches for such a particle are an active field of research. This
dissertation acts as a review of the aforementioned concepts.
