  We have included the effective description of squark interactions with
charginos/neutralinos in the MadGraph MSSM model. This effective description
includes the effective Yukawa couplings, and another logarithmic term which
encodes the supersymmetry-breaking. We have performed an extensive test of our
implementation analyzing the results of the partial decay widths of squarks
into charginos and neutralinos obtained by using FeynArts/FormCalc programs and
the new model file in MadGraph. We present results for the cross-section of
top-squark production decaying into charginos and neutralinos.
