[en] The properties of lepton interaction are compared with those of hadrons interactions and the model for leptons is studied. The experimental results seem to suggest a certain similarity between the properties of the two kinds of interactions and the so-called muon-electron universality may correspond to a lepton-nucleon universality in the theory of SU3; finally lepton integration can be described fairly well by introducing a quantum number corresponding to the strangeness in the hadron family