to provide a non-Abelian chiral symmetry and axial vector states. This is in keeping with the phenomenological spirit of [2,113]. In this chapter we compute with our phenomenological model the masses and decay constants for the pion and the rho and a$_{1}$ vector mesons. We find that the model gives comparable predictions to the pure AdS models within 12% of the QCD values. We believe these results provide support for the robustness of the predictions of these holographic models. The geometry we propose returns to pure AdS space in the ultra-violet, so we do not address here the absence of asymptotic freedom in the grav- ity description. As pointed out in [144], the gravity theory should only be used up to a UV cut off, corresponding to the scale at which QCD switches from perturbative to non-perturbative behaviour. Above that cut off the gravitational dynamics must become non-perturbative with its loop correc- tions completely dominating the classical results. The correct UV dynamics should be encoded at that cut off by correcting the values of higher dimen- sion operator couplings. In principle, these can be tuned in the AdS/CFT approach to produce the holographic equivalent of a perfect lattice action. As a small example of these ideas we consider the matching of the five dimensional gauge coupling in the UV. In [2,113] this coupling is matched to the perturbative result for the vector vector correlator in QCD. The AdS gravitational dual presumably describes a strongly coupled conformal theory in the UV and so the correlator behaviour matches the logarithmic result of the conformal but weakly coupled UV behaviour of QCD. It is surprising that the numerical coefficient of the log term can be matched though. In chapter 5 we indicated that this matching might underpredict g$_{5}$ by as much as 30%. We perform a similar analysis here, and find that once again the ideal value of g$_{5}$ is higher than that indicated in [2, 113], this time by 18%. This provides a measure of non-perturbative corrections 87