  The Interacting Gluon Model (IGM) is a tool designed to study energy flow,
especially stopping and leading particle spectra, in high energy hadronic
collisions. In this model, valence quarks fly through and the gluon clouds of
the hadrons interact strongly both in the soft and in the semihard regime.
Developing this picture we arrive at a simple description of energy loss, given
in terms of few parameters, which accounts for a wide variety of experimental
data. This text is a survey of our main results and predictions.
