In the Lund Group, based upon a semiclassical treatment of the massless relativistic string (MRS) and coupled with experiences of e+e-annihilation reactions, the author has developed a model for inelastic leptoproduction. Although it does fit to all data from the EMC generation of experiments, the very large increase in the main dynamical variables at HERA energies will most certainly force one to be much more precise. Here is the present model, however, as it is implemented in the Monte Carlo programs ARIADNE, JETSET and LEPTO (the first two contain the main specific dynamics of the model).
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