  A selected set of topics along the borderline between perturbative and
nonperturbative QCD in exclusive reactions are studied. Specific problems,
related to different mechanisms of momentum transfer to an intact hadron, are
discussed. Calculations of the space-like form factors of the pion and the
nucleon are reviewed within a convolution scheme of short-distance (hard) and
large-distance (soft) contributions which takes into account soft gluon
emission and the intrinsic transverse hadron size. The failure of this scheme
to reproduce the existing experimental data signals sizeable higher-order
perturbative corrections (a K-factor of order two) and/or higher-twist
contributions.
