One of the central issues in High Energy Physics is the close interchange
between Theory and Experiment. Ever since I know Andrzej Bia{\l}as, I know him
as one of the theorists most interested in experimental data. This has
naturally led to continuous fruitful contacts. Even though we have been working
somehow together since about 1968, we so far have only one single publication
in common. This was back in 1969 and it was on means to efficiently study what
we then called (exclusive) Multihadron Final States. At that time this meant 3-
or at best 4-particle final states of two-hadron collisions at cms energies of
some 4 GeV (not TeV!). The field of multiparticle dynamics was in fact the
domain of Polish high-energy physicists. The first of a very successful (and
still lasting) series of annual International Symposia on Multiparticle
Dynamics was organized in Paris in 1970, but essentially by Polish physicists.
Andrzej himself was not attending, but it was he who organized the third in
these series in (of course) Zakopane. Since heavy ion-collisions, another field
of major interest for Andrzej, will be covered by others, I here will restrict
myself mainly to the collisions of two elementary particles.Comment: 32 pages, 26 figure