  We review and compare two different approaches to radiation reaction in
classical electrodynamics of point charges: a local calculation of the
self-force using the charge equation of motion and a global calculation
consisting in integration of the electromagnetic energy-momentum flux through a
hypersurface encircling the world-line. Both approaches are complementary and,
being combined together, give rise to an identity relating the locally and
globally computed forces. From this identity it follows that the Schott terms
in the Abraham force should arise from the bound field momentum and can not be
introduced by hand as an additional term in the mechanical momentum of an
accelerated charge. This is in perfect agreement with the results of Dirac and
Teitelboim, but disagrees with the recent calculation of the bound momentum in
the retarded coordinates. We perform an independent calculation of the bound
electromagnetic momentum and verify explicitly that the Schott term is the
derivative of the finite part of the bound momentum indeed. The failure to
obtain the same result using the method of retarded coordinates tentatively
lies in an inappropriate choice of the integration surface. We also discuss the
definition of the delta-function on the semi-axis involved in the local
calculation of the radiation reaction force and demonstrate inconsistency of
one recent proposal.
