  A practical method of calculating weights implementing the Bose - Einstein
interference effects is presented. The usefulness of the method is demonstrated
for the events generated by the JETSET/PYTHIA code to describe the UA1
proton-antiproton data at 630GeV. A good description of data is achieved with a
reasonable value of the Gaussian width of a two-particle weight factor, which
is the only free parameter in our calculations.
