  In these notes we present a detailed and complete scheme for the calculation
of polarization phenomena in elastic electron-nucleon scattering. The
longitudinal and transversal components of the polarization for the scattered
nucleon, induced by the scattering of longitudinally polarized electrons and
the asymmetries for the collision of polarized electrons with a polarized
nucleon target are included. The calculations are done in the framework of the
one-photon mechanism, in the Breit system, which is the most convenient for the
analysis of polarization effects. We briefly discuss the region of
applicability of such model and other mechanisms (radiative and electroweak
corrections) which may come into this idealized picture.
