  Hard scattering in p-p collisions was discovered at the CERN ISR in 1972, by
the method of leading particles, which proved that the partons of Deeply
Inelastic Scattering strongly interacted with each other. Further ISR
measurements utilizing inclusive single or pairs of hadrons established that
high pT particles are produced from states with two roughly back-to-back jets
which are the result of scattering of constituents of the nucleons as described
by Quantum Chromodynamics. These techniques, which are the only practical
method to study hard-scattering and jet phenomena in Au+Au collisions at RHIC,
will be reviewed.
