Asymmetric Bose-Einstein effect

Recent results on modelling Bose-Einstein effect in Monte Carlo generators for a source with no spherical symmetry (as seen in the data on $Z^0$ hadronic decays) are reported. Modifications of the weight method necessary for $W^{+}{W}^{-}$ decays are presented and some preliminary results concerning the “inter-$W$” interference effects are discussed.