  I discuss a few issues related to the systematic error on the top mass
measurement at hadron colliders, due to hadronization effects. Special care is
taken about the impact of bottom-quark fragmentation in top decays, especially
on the reconstruction relying on final states with leptons and J/psi in the
dilepton channel. I also debate the relation between the measured mass and its
theoretical definition, and report on work in progress, based on the Monte
Carlo simulation of fictitious top-flavoured hadrons, which may shed light on
this issue and on the hadronization systematics.
