We present examples for the calculation of the distribution and fragmentation
functions using the representation in terms of non-local matrix elements of
quark field operators. As specific examples, we use a simple spectator model to
estimate the leading twist quark distribution functions and the fragmentation
functions for a quark into a nucleon or a pion.Comment: 5 pages RevTeX, talk presented at the First ELFE School on
Confinement Physics, 22-28 July 1995, Cambridge, Englan