  We present a new approach for the simulation of Beyond Standard Model (BSM)
physics within the Herwig++ event generator. Our approach is more generic than
previous methods with the aim of minimising the effort of implementing further
new physics models. Spin correlations, which are important for BSM models due
to new heavy fermions and bosons, are discussed and their effects demonstrated
for the Minimal Supersymmetric Standard Model (MSSM) and Randall-Sundrum Model
using our new framework.
