In this paper, we demonstrate the profound relation between the complete screening model and a considerable variety of energy and lineshape data from Auger spectroscopy. Exploitation of the experimental systematics of the LMM Auger parameter of the 4d metals elucidates screening mechanisms as well as the nature of d-band holes and extension of the analysis to the 3d and 5d metals indicates similar results. Application to metallic alloys clarifies and permits extraction of electronic structure information. Double ionization experiments produce quasi-atomic Pd MVV spectra, in agreement with the predictions of the complete screening model and represents the first observation of the clear influence of complete screening on spectral shape.