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Models of hadron structure are associated with a hadronic scale which allowsby perturbative evolution to calculate observables in the deep inelasticregion. The resolution of Dyson-Schwinger equations leads to the freezing ofthe QCD running coupling (effective charge) in the infrared, which is bestunderstood as a dynamical generation of a gluon mass function, giving rise to amomentum dependence which is free from infrared divergences. We use this newdevelopment to understand why perturbative treatments are working reasonablywell despite the smallness of the hadronic scale.

Non-perturbative momentum dependence of the coupling constant and hadronic models