The "Superworld" is a subject of formidable interest for the immediate future of
subnuclear physics to which Zichichi has contributed with a series of important
papers of phenomenological and theoretical nature. These papers represent a
must-have collection, not only for their originality but also for their complete
analysis of expected scenarios on the basis of today's knowledge of physics. The
contributions are divided into two parts. The first deals with the problem of
the convergence of the three fundamental forces of nature measured by the gauge
couplings, with the onset of the energy threshold for the production of the
lightest supersymmetric particles and with the existence of