Hadronic Structure from Perturbative dressing in QCD - The Valon Model

In the Framework of {\it{valon model}} we have calculated the parton distribution in a valon for both the polarized and unpolarized cases. These distributions are originated purely from the dressing of a valence quark in QCD and are common to all hadrons. Structure functions, $F_2^{p,\pi }$, are obtained, which agree rather well with the experimental results. A simple relation between $F_2^p$ and $F_2^{\pi }$ is inferred. For the polarized structure function, $g_1$ while the model gives good agreement with data, it requires a sizable angular momentum contribution to the spin of the valon, and hence to that of proton. This contribution is calculated.