  We apply the Schroedinger Functional (SF) formalism to determine the
renormalisation group running of four-fermion operators which appear in the
effective weak Hamiltonian of the Standard Model. Our calculations are done
using Wilson fermions and the parity-odd components of the operators.
Preliminary results are presented for the operator $O_{VA}=(\bar s \gamma_\mu
d)(\bar s \gamma_\mu \gamma_5 d)$.
