  This paper contains a review of the main results of a search of regularities
in collective variables properties in multiparticle dynamics, regularities
which can be considered as manifestations of the original simplicity suggested
by QCD. The method is based on a continuous dialog between experiment and
theory. The paper follows the development of this research line, from its
beginnings in the seventies to the current state of the art, discussing how it
produced both sound interpretations of the most relevant experimental facts and
intriguing perspectives for new physics signals in the TeV energy domain.
