Diffraction phenomenology with massive gluons: some recent developments

In this talk we introduce the main features of a QCD-based model in which the coupling ${\alpha }_s$ is constrained by an infrared mass scale. We show recent applications of this model to hadron-hadron collisions, gap survival probability calculations, and soft gluon resummation techniques. These results indicate a smooth transition from non-perturbative to perturbative behaviour of the QCD.