  The aim of these lectures is to give a self-contained introduction to
nonrelativistic potential models, to their formulation as well as to their
possible applications. At the price of some lack of (in a mathematical sense)
rigorous derivations, we try to give a feeling and understanding for the
simplest conceivable method to extract the explicit form of the forces acting
between quarks from the interplay between experimental observations and
theoretical considerations. According to this spirit, we demonstrate, in
detail, how to obtain the underlying Hamiltonian and how to determine the
Lorentz structure of the quark--(anti-)quark interaction potential from
well-established experimental facts.
