  The colour connection structure of QCD ($2\to2$) processes is discussed, with
emphasis on its application to the supersymmetric 2 parton $\to$ 2 sparton
processes, which are currently being implemented in the HERWIG Monte Carlo
event generator. The procedure described by Marchesini and Webber is found to
be inadequate, and a new method is proposed. However, this alteration is
unlikely to significantly affect the theoretical predictions for soft gluon
radiation. A complete list of supersymmetric QCD $2\to2$ matrix elements and
their colour decompositions is presented.
